JP2004014367A - Light source device and projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of providing practical high-luminance luminous flux by using multiple light emitting diode elements, and of reducing a projection area (emission luminous flux area) of the light source as compared with the number of used light emitting diode elements, and allowing miniaturization of the device itself. <P>SOLUTION: Components each comprising a light emitting diode and a reflecting surface coupled with it are circularly arranged, and the circular units are disposed hierarchically form without blocking each luminous flux. The light emitting diodes are disposed in a form where the optical axis thereof is directed to the center axis of the device, and each reflecting surface is disposed at such an angle as to face the light emitting part of the corresponding light emitting diode and to reflect the optical axis of the light emitting diode in the optical axis direction of the device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device and a projection display device, and more particularly to a light source device and a projection display device using light emitting diodes.
[0002]
[Prior art]
Generally, a high-pressure discharge lamp or the like having high luminous efficiency is used as a light source of a projection display device. When a light emitting diode is used as a light source, a large number of light emitting diode elements are required because the light intensity of a single light emitting diode element is small, and a light source is often configured by arranging many elements.
[0003]
FIG. 8 shows a configuration example of a conventional light source (hereinafter, referred to as a light source device) of a projection display device using light emitting diodes. This light source device is composed of a plurality of light emitting diode elements 201 and a substrate 202, and has a configuration in which a plurality of light emitting diode elements 201 are simply laid upward and tightly on a substrate 202 (here, a circular substrate). .
[0004]
In addition, as a conventional device using a light emitting diode, for example, there are techniques disclosed in Japanese Patent Application Laid-Open No. 2001-007406, Japanese Patent Application Laid-Open No. 11-163418, Japanese Patent Application Laid-Open No. 11-177144, etc. The arrangement direction is different from the gist or configuration of the present application, for example, it coincides with the optical axis direction of the device.
[0005]
[Problems to be solved by the invention]
However, the light source device of the conventional projection display device has the following problems. The first point is that the light-emitting diode element alone has a small amount of light, so that a large number of light-emitting diodes are used to extract a large amount of light flux. ) Increases, and at the same time, the size of the light source device itself increases. Second, as described above, when the size of the light source device increases, the size of the entire device on which the light source device is mounted also increases.
[0006]
The present invention has been made in view of such a problem, and a practical high-luminance luminous flux can be obtained using a large number of light emitting diode elements, and the number of light emitting diode elements used is small. It is an object of the present invention to provide a light source device capable of reducing the projection area (emission light beam area) of a light source and reducing the size of the device itself, and a projection display device equipped with the light source device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 provides a light emitting diode and a reflection surface paired with the light emitting diode, in which the components are arranged in a circle, and the circular units are arranged in a hierarchy with different circle radii. The light-emitting diode is disposed so that its optical axis faces the central axis of the device, the reflecting surface faces the light-emitting portion of the light-emitting diode, and reflects the optical axis of the light-emitting diode in the direction of the device optical axis. The circular unit is arranged, and is characterized in that the light flux emitted from the light emitting diode and reflected by the reflection surface is arranged so as not to be blocked from each other.
[0008]
According to a second aspect of the present invention, in the first aspect, the light emitting diodes are arranged so as to be orthogonal to the optical axis of the device.
[0009]
According to a third aspect of the present invention, in the first aspect of the present invention, the reflecting surface is arranged at a 45-degree relationship with the optical axis of the light emitting diode.
[0010]
According to a fourth aspect of the present invention, in the first aspect of the present invention, the units are arranged such that a light beam emitted from the device is a parallel light beam.
[0011]
According to a fifth aspect of the present invention, in the first aspect of the present invention, the reflecting surface is disposed very close to the light emitting portion of the light emitting diode.
[0012]
The invention according to claim 6 includes a light source device using a light emitting diode, a display device that performs image modulation using light emitted from the light source device as illumination light, and a projection lens that projects light from the display device onto a screen. The projection type display device, wherein the light source device includes a light emitting diode, a component including a reflection surface paired with the light emitting diode, arranged in a circle, circular units arranged in a hierarchy with different circle radii, and a light emitting diode. Is arranged so that its optical axis faces the central axis of the device, the reflecting surface faces the light emitting portion of the light emitting diode, and is arranged at an angle that reflects the optical axis of the light emitting diode in the device optical axis direction. The light emitting device is characterized in that light beams emitted from the light emitting diodes and reflected by the reflection surface are arranged so as not to be blocked from each other.
[0013]
According to a seventh aspect of the present invention, there is provided a projection type display device using the light source device according to any one of the first to fifth aspects as an illumination system, wherein red (R), green (G), blue (B ), Three light source devices are configured using the light emitting diode elements of each emission color, and the emitted light fluxes of each color from the three light source devices are combined by a color combining element to illuminate the display device as illumination light. The image-modulated light is projected through a projection lens.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, a light source device 1 according to an embodiment of the present invention will be described with reference to FIGS. Then, the projection display device 100 according to the embodiment of the present invention will be described with reference to FIG. The projection display device 100 is configured using the light source device 1 as an illumination system.
[0015]
FIG. 1 is a cross-sectional view illustrating a configuration of a light source device 1 according to a first embodiment of the present invention as viewed from a side. FIG. 2 is a diagram showing a configuration of the light source device 1 as viewed from above (the surface on the side where light is emitted and emits light). The light source device 1 has a substantially cylindrical shape as a whole, and particularly has a substantially conical shape (an inverted conical shape) formed by an arrangement of a plurality of light emitting diode elements in terms of an internal structure. FIG. 1 shows a cross section passing through the central axis of the cylinder.
[0016]
In the present light source device 1, as shown in FIG. 3, a component 13 including a light emitting diode element 11 and a reflecting surface 12 that is paired with the light emitting diode element 11 is used. Light emitted from the light emitting diode element 11 is reflected by the reflection surface 12 and emitted upward. Here, particularly, the reflection surface 12 is arranged so as to have a 45-degree relationship with the optical axis of the light emitting diode element 11. As a result, the light from the light emitting diode element 11 is reflected at the reflection surface 12 by 90 degrees and emitted upward (in the direction of the upper surface of the light source device 1). The component 13 is a unit for convenience of explanation, and the procedure for assembling the entire light source device 1 is not particularly limited.
[0017]
In this embodiment, a light source device in the case of using a light emitting diode element of φ5 mm type as the light emitting diode element 11 and using 64 light emitting diode elements will be described. Hereinafter, this configuration will be described.
[0018]
As shown in FIGS. 1 and 2, in the light source device 1, a unit (hereinafter, a light-emitting unit) 14 in which components 13 each including a light-emitting diode 11 and a reflection surface 12 are arranged in a circle is arranged in a hierarchical (step-like) manner. It is configured by arranging. The substantially conical light emitting diode array is housed in a cylindrical case (housing) 15. As shown in FIG. 1, the component 13 including the light emitting diode element 11 and the reflection surface 12 is arranged in the light source device 1 in a substantially horizontal direction (a direction perpendicular to the side surface of the housing). In addition, as shown in FIG. 2, the optical axis of the light emitted from the light emitting diode element 11 is arranged so as to face the center axis direction of the substantially cylindrical case 15 and the substantially conical light emitting diode array.
[0019]
As shown in FIGS. 1 and 2, the components 13 and the circular light-emitting unit 14 are arranged in a hierarchical manner (step-like shape) in such an arrangement that the luminous flux emitted from the light-emitting diode element 11 of each component 13 is not obstructed from each other. To place. Units with smaller circle radii are placed one on top of the other from bottom to top. In this embodiment, in particular, the light emitting units 14A to 14D are arranged as a light emitting unit 14 so as to be vertically stacked in four layers. This number of stages may be arbitrary. The light emitting unit 14 is also a convenient unit for explanation.
[0020]
As shown in FIG. 1, light emitted from each light emitting diode element 11 which is arranged in a substantially horizontal direction (a shape orthogonal to the optical axis of the device 1) is reflected upward by a pair of reflection surfaces 12. To form an outgoing light beam (illumination light beam) surface as the light source device 1.
[0021]
As shown in FIG. 2, on the upper surface of the light source device 1 = the light-emitting surface (emission light beam surface), the reflection surface 12 of the component 13 is arranged to be exposed. A part of the light emitting diode element 11 that is slightly viewed along with the reflecting surface 12 is a radiation part on the front surface.
[0022]
The single light-emitting diode element 11 is arranged at the center of the bottom surface of the case 15 (the center point of the circular unit 14A), and serves as a light beam at the center point of the emitted light beam surface.
[0023]
The reflection surface 12 can be formed by a technique such as mirror finishing such as metal evaporation or plating. The reflection surface 12 is arranged at a very short distance from a radiating portion on the front surface of the light emitting diode element 11 (a part on the hemispherical side in the bullet-shaped element 11). When the optical axis of the light emitting diode element 11 is in the horizontal direction, the reflection surface 12 has an inclination of 45 degrees with respect to the light axis, and the light flux from the element 11 is reflected by the reflection surface 12 at 90 degrees, and is reflected in the vertical direction (the upper surface of the light source device 1). Direction). The light emitting diode element 11 used here has a sharp directivity, and light emitted from the light emitting diode element 11 is reflected by the reflecting surface 12 with almost no loss. The configuration for giving the light emitting diode element 11 directivity is a known technique.
[0024]
With such a configuration, compared to a configuration in which the same number of light emitting diode elements are simply arranged on a plane, high brightness is achieved while minimizing the area of the emitted light beam (illumination light beam) as the light source device, and at the same time, the light source device Has been downsized.
[0025]
FIG. 4 is a schematic view showing the light source device 1 as viewed from above and showing only the reflecting surface 12 and the light emitting diode elements 11 at the center of the circle, and the optical axis from each light emitting diode element 11 in the circular unit 14. Are indicated by dots on the reflection surface 12. In the light source device 1 of this embodiment, φ5 mm type light emitting diode elements are used, and nine light emitting units are arranged at 40 ° intervals in the light emitting unit 14A, 14 light emitting units are arranged in approximately 25 ° intervals in the light emitting unit 14B, and 20 ° intervals in the light emitting unit 14C. In the light-emitting unit 14D, 18 elements are arranged in a circle at intervals of about 16 °. One light-emitting diode element 11 is arranged in a gap at the center of the bottom surface of the light source device 1. With such an arrangement, a total of 64 light emitting diode elements 11 are arranged in the range of a perfect circle of φ37.
[0026]
FIG. 5 shows an arrangement of light emitting diode elements in a conventional configuration for comparison with the configuration of the present embodiment. FIG. 5 shows a configuration in which a conventional φ5 mm type light-emitting diode element is simply arranged upward and tightly within a true circle of φ37. In this arrangement, only a total of 37 light emitting diode elements can be arranged within the range of a perfect circle of φ37. In the arrangement of the present embodiment, as compared with this conventional arrangement, the luminous flux from more light-emitting diode elements can be integrated per the same area of the light-emitting portion (outgoing luminous flux surface) as the light source device, so This is advantageous when a light source is configured by arranging diode elements. Further, when an attempt is made to configure a light source device using the same number of light emitting diode elements, the arrangement of the present embodiment reduces the area of the emitted light beam surface as the light source device as compared with the case where the light source device is simply arranged on a plane. Can be.
[0027]
FIG. 6 shows a configuration in which the number of light emitting diode elements to be arranged is further increased by using the light source device 1 of the above embodiment. In addition to the arrangement described above, a light emitting unit 14E (hatched portion) is further arranged on the light emitting unit D. The upper left is a top view, the lower left is a side cross-sectional view, and the upper right is a schematic top view in which only the light emitting unit is virtually shown. As the light emitting unit 14E, the light emitting diode elements 11 are arranged in two rows in a circular shape upward (in the direction of the emitted light beam). In the ring of φ55, 24 light emitting diode elements 11 are arranged at 15 ° intervals on the inside and 30 light emitting diode elements 11 at 12 ° intervals on the outside. An apparatus can be provided. In this configuration example, a total of 118 light emitting diode elements are arranged.
[0028]
Next, FIG. 7 shows a configuration of the projection display apparatus 100 according to the embodiment of the present invention. The projection display device 100 forms an illumination system using the light source device 1 of the above-described embodiment. An example in which light-emitting diode elements of each of red (R), green (G), and blue (B) are used as a light source device of the projection display device 100 is shown. The projection display device 100 includes a light emitting diode unit (R) 101 for emitting red light, a light emitting diode unit (G) 102 for emitting green light, a light emitting diode unit (B) 103 for emitting blue light, and a condenser lens 104. , A color synthesizing element 105, and a display device 106. Each of the light emitting diode units 101 to 103 has the arrangement structure of the embodiment shown in FIG. 6, and is configured by light emitting diode elements of different colors (R, G, B).
[0029]
Normally, an integration lens or a condenser lens is used as the condenser lens 104. A cross dichroic prism, a dichroic mirror, or the like is used as the color combining element 105. Here, components that can be arranged from the color combining element 105 to the display device 106 are omitted. The display device 106 is a device for providing image information, and an LCD (Liquid Crystal Display Panel), a DMD (Digital Mirror Device), or the like is used. The respective color lights from the light emitting diode units 101 to 103 are combined in the color combining element 105 to form illumination light, and are emitted toward the display device 106 to be illuminated. The display device 106 is illuminated by the illumination light, and the image modulated by the image information provided by the display device 106 is projected on a screen via a projection lens (not shown) to display an image.
[0030]
The embodiment of the invention has been described above. The embodiment described above is an example of a preferred embodiment of the present invention, and the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. .
[0031]
【The invention's effect】
As is clear from the above description, according to the light source device and the projection display device of the present invention, the first point is that light emitted from the light emitting diode element is used through the element and the pair of reflecting surfaces. Since the area of the light source device light emitting unit (emission light beam surface) can be reduced, a larger number of light emitting diode elements are arranged in a projection plane viewed from the light receiving side of the light source device than in the case where the light emitting diode elements are simply arranged on a plane. The arrangement and integration of the light-emitting diode elements described above have an effect that an illumination light beam having a large luminance and a small light-emitting portion area can be obtained.
[0032]
Second, the area of the light emitting portion can be reduced as compared with the case where the same number of light emitting diode elements are used, and the entire device (projection display device) using the light source device can be configured to be small. The effect is possible.
[0033]
Third, since the area of the light emitting portion can be reduced, the light source is configured using light emitting diode elements of each of the red (R), green (G), and blue (B) emission colors. There is an effect that the entire device using the light source can be configured to be small.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a light source device 1 according to an embodiment of the present invention.
FIG. 2 is a top view of the light source device 1 according to the embodiment of the present invention.
FIG. 3 is a view showing a component 13 including a light emitting diode element 11 and a reflection surface 12;
FIG. 4 is a schematic view showing a light emitting unit on the upper surface of the light source device 1.
FIG. 5 is a diagram showing a configuration in which light emitting diodes are arranged in a circular plane having the same radius as the configuration of the present embodiment for comparison.
FIG. 6 is a top view, a cross-sectional view, and a schematic diagram of a light-emitting unit showing a configuration in a case where the light-emitting diode utilization efficiency is further increased by using the light source device 1 according to the embodiment of the present invention.
FIG. 7 is a diagram showing a configuration of a projection display device 100 according to an embodiment of the present invention.
FIG. 8 is a schematic diagram illustrating a configuration example of a conventional light source device.
[Explanation of symbols]
Reference Signs List 1 light source device 100 projection display device 11 light-emitting diode element 12 reflecting surface 13 component 14 composed of 11 and 12 light-emitting unit (circular array of components 13)
14A Light emitting unit 14B Light emitting unit 14C Light emitting unit 14D Light emitting unit 15 Case (substantially cylindrical housing)
14E light emitting unit (upward)
101 Light emitting diode unit (R)
102 Light emitting diode unit (G)
103 Light emitting diode unit (B)
104 Condensing lens 105 Color combining element 106 Display device (image information device)
201 light emitting diode element 202 substrate

Claims (7)

Components consisting of a light emitting diode and a reflective surface that is paired with the light emitting diode are arranged in a circle, and the circular units are arranged in a hierarchy with different circle radii,
The light emitting diode is arranged so that its optical axis is directed to the central axis of the device,
The reflection surface faces the light emitting portion of the light emitting diode, and is arranged at an angle that reflects an optical axis of the light emitting diode in a device optical axis direction,
The light source device according to claim 1, wherein the circular unit has a structure in which light beams emitted from the light emitting diodes and reflected by the reflection surface are arranged so as not to be blocked from each other. The light source device according to claim 1, wherein the light emitting diodes are arranged orthogonal to a device optical axis. The light source device according to claim 1, wherein the reflection surface is disposed at a 45-degree relationship with an optical axis of the light emitting diode. The light source device according to any one of claims 1 to 3, wherein the unit is arranged such that a light beam emitted from the device is a parallel light beam. The light source device according to any one of claims 1 to 4, wherein the reflection surface is disposed very close to a light emitting unit of the light emitting diode. A projection display apparatus comprising: a light source device using a light-emitting diode; a display device that modulates an image using light emitted from the light source device as illumination light; and a projection lens that projects light from the display device onto a screen. hand,
The light source device,
Components consisting of a light emitting diode and a reflective surface that is paired with the light emitting diode are arranged in a circle, and the circular units are arranged in a hierarchy with different circle radii,
The light emitting diode is arranged so that its optical axis is directed to the central axis of the device,
The reflection surface faces the light emitting portion of the light emitting diode, and is arranged at an angle that reflects an optical axis of the light emitting diode in a device optical axis direction,
The projection display device, wherein the circular unit has a structure in which light beams emitted from the light emitting diodes and reflected by the reflection surface are arranged so as not to be blocked from each other. A projection display device using the light source device according to any one of claims 1 to 5 as an illumination system,
Three light source devices are configured using light-emitting diode elements of each color of red (R), green (G), and blue (B), and the emitted light beams of each color from the three light source devices are combined by a color combining element. A display device as illumination light, and projecting the light image-modulated by the display device via a projection lens.

Images