JP4037691B2 - Light source device and projection display device - Google Patents

Description

[0001]
BACKGROUND 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]
In general, 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 the light source, the light amount of the light emitting diode element alone is small, so a large number of light emitting diode elements are required, and the light source is often configured by arranging a large number of elements.
[0003]
FIG. 8 shows a configuration example of a light source (hereinafter referred to as a light source device) of a conventional projection display device using a light emitting diode. This light source device is composed of a plurality of light emitting diode elements 201 and a substrate 202, and has a structure 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]
As conventional devices using light emitting diodes, there are technologies disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-007406, Japanese Patent Application Laid-Open No. 11-163418, Japanese Patent Application Laid-Open No. 11-177144, and the like. The direction of the arrangement is different from the gist and configuration of the present application, such as being coincident with the optical axis direction of the apparatus.
[0005]
[Problems to be solved by the invention]
However, the light source device of the conventional projection display device has the following problems. As a first point, since the light quantity of a single light emitting diode element is small, a large number of light emitting diode elements are used to extract a large amount of light flux, so that the projected area (outgoing light flux area) of the light source device in which the light emitting diode is mounted is used. ) Increases, and at the same time, the light source device itself increases in size. As a second point, when the light source device becomes large as described above, the entire device on which the light source device is mounted is also enlarged.
[0006]
The present invention has been made in view of such problems, and a practical high-luminance luminous flux can be obtained using a large number of light-emitting diode elements, and compared with the number of light-emitting diode elements used. It is an object of the present invention to provide a light source device capable of reducing the projection area (emitted light flux area) of the 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]
To achieve the above object, a first aspect of the present invention, light emitting diodes and components made in pairs and anti reflecting surface are arranged in a circle, 2 and more circular unit circle radius are different, device light and a shaft center arranged optical center emitting diodes, each light emitting diode that the optical axis thereof is arranged so as to face the device optical axis, each reflecting surface is a surface on the light emitting portion of the light-emitting diode comprising a pair The light emitting diodes are arranged at an angle that reflects the light emitted from the light emitting diodes in the same direction as the device optical axis, and each of the circular units overlaps with another circular unit in the direction of the device optical axis. By being arranged concentrically and hierarchically around the optical axis, the light beams emitted from the light emitting diodes and reflected by the reflecting surface are not blocked from each other .
[0008]
A second aspect of the invention is characterized in that, in the first aspect of the invention, the light emitting diodes are arranged in a shape perpendicular to the optical axis of the device.
[0009]
A third aspect of the invention is characterized in that, in the first aspect of the invention, the reflecting surface is disposed in a relationship of 45 degrees with the optical axis of the light emitting diode.
[0010]
A fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, the unit is arranged so that the emitted light beam of the apparatus becomes a parallel light beam.
[0011]
The invention according to claim 5 is the invention according to any one of claims 1 to 4, characterized in that the reflecting surface is arranged in the immediate vicinity of the light emitting portion of the light emitting diode.
[0012]
The invention described in claim 6 includes a light source device using a light emitting diode, a display device that performs image modulation using an emitted light beam from the light source device as illumination light, and a projection lens that projects light from the display device onto a screen. a projection display device, a light source device, the light emitting diode and parts made in pairs and anti reflecting surface are arranged in a circle, 2 and more circular unit circle radius are different, the center of the device optical axis and a disposed optical axis center emitting diodes, each light emitting diode that the optical axis thereof is arranged so as to face the device optical axis, each reflecting surface, facing the light emitting portion of the light emitting diode to be paired, and emission Arranged at an angle that reflects the light emitted by the diode in the same direction as the optical axis of the device.Each circular unit is centered on the optical axis of the device so that part of it overlaps with other circular units in the direction of the optical axis of the device. When That concentrically and by being arranged in a hierarchy, and wherein the light beam emitted from the light emitting diode is reflected by the reflecting surface has a structure which is not blocked from each other.
[0013]
A seventh aspect of the invention is a projection 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 The three light source devices are configured using the light emitting diode elements of the respective emission colors), the emitted light beams of the respective colors from the three light source devices are synthesized by the color synthesis element, and the display device is illuminated as illumination light. A feature is that the image-modulated light is projected through a projection lens.
[0014]
DETAILED DESCRIPTION OF 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, with reference to FIG. 7, the projection type display apparatus 100 in embodiment of this invention is demonstrated. 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 showing a configuration of the light source device 1 according to the first embodiment of the present invention as viewed from the side. FIG. 2 is a diagram showing a configuration of the light source device 1 as viewed from the upper surface (the surface on the side where the light beam is emitted and emitted). The light source device 1 has a substantially cylindrical shape as a whole, and particularly has a substantially conical shape (inverted conical shape) due to an arrangement of a plurality of light emitting diode elements in terms of internal structure. FIG. 1 shows a cross section passing through the central axis of the cylinder.
[0016]
In the light source device 1, a component 13 including a light emitting diode element 11 and a reflective surface 12 paired with the light emitting diode element 11 is used as shown in FIG. 3. The light emitted from the light emitting diode element 11 is reflected by the reflecting surface 12 and emitted upward. Here, in particular, the reflecting surface 12 is disposed 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 by 90 degrees on the reflecting surface 12 and is emitted upward (in the upper surface direction of the light source device 1). Note that the component 13 is a convenient unit for 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 where a light emitting diode element of φ5 mm type is used as the light emitting diode element 11 and 64 light emitting diode elements are used will be described. This configuration will be described below.
[0018]
As shown in FIG. 1 and FIG. 2, the light source device 1 includes a unit (hereinafter referred to as a light emitting unit) 14 in which components 13 including a light emitting diode 11 and a reflecting surface 12 are arranged in a circle (hereinafter referred to as a light emitting unit) in a hierarchical shape (step shape). It is configured by arranging. The substantially conical light emitting diode array is accommodated in a cylindrical case (housing) 15. As shown in FIG. 1, the component 13 including the light emitting diode element 11 and the reflecting surface 12 is arranged in a substantially horizontal direction (a vertical direction with respect to the side surface of the housing) in the light source device 1. As shown in FIG. 2, the light axis of the light emitted from the light emitting diode element 11 is arranged so as to face the central 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 units 14 are arranged in a hierarchy (stepped shape) in such an arrangement that the light beams emitted from the light-emitting diode elements 11 of the components 13 are not blocked from each other. To place. Arrange the units from the bottom to the top in order from the unit with the smallest circle radius. In this embodiment, in particular, the light emitting units 14A to 14D are arranged as a light emitting unit 14 in a four-step layered manner. 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, the light emitted from each light emitting diode element 11 arranged in a substantially horizontal direction (a shape perpendicular to the optical axis of the device 1) is reflected upward by a pair of reflecting surfaces 12. And forms an outgoing light beam (illumination light beam) surface as the light source device 1.
[0021]
As shown in FIG. 2, the reflection surface 12 of the component 13 is exposed on the upper surface of the light source device 1 = the light emitting surface (emitted light beam surface). A little peeking along with the reflecting surface 12 is the radiation part on the front surface of the light emitting diode element 11.
[0022]
A 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 becomes a light beam at the center point of the outgoing light beam surface.
[0023]
The reflecting surface 12 can be formed by a technique such as mirror deposition such as metal vapor deposition or plating. The reflecting surface 12 is disposed at a distance that is extremely close to the radiating portion on the front surface of the light emitting diode element 11 (portion on the hemispherical side in the shell-shaped element 11). Further, when the optical axis of the light emitting diode element 11 is set to the horizontal direction, the reflecting surface 12 has an inclination of 45 degrees with respect to it, and the light flux from the element 11 is reflected by 90 degrees on the reflecting surface 12 to be perpendicular (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. A configuration for providing the light emitting diode element 11 with 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 luminance is achieved while minimizing the area of the emitted light beam (illumination light beam) as a light source device, and at the same time, the light source device Is miniaturized.
[0025]
FIG. 4 is a schematic view in which the light source device 1 is viewed from the top and only the light-emitting diode elements 11 centered on the reflection surface 12 and the circle are virtually described, and the optical axis from each light-emitting diode element 11 in the circular unit 14. Are indicated by dots on the reflecting surface 12. The light source device 1 of the present embodiment uses φ5 mm type light emitting diode elements. The light emitting unit 14A has 9 light emitting units at intervals of 40 °, the light emitting unit 14B has 14 light at about 25 ° intervals, and the light emitting unit 14C has 20 ° intervals. In the light emitting unit 14D, 22 elements are arranged in a circle at intervals of about 16 °. Further, one light emitting diode element 11 is disposed in the 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 used and is simply arranged tightly upward in a true circle of φ37. In this arrangement configuration, only 37 light emitting diode elements in total can be arranged within the range of a perfect circle of φ37. In the arrangement of this embodiment, compared to this conventional arrangement example, a larger number of light emitting diode elements can be integrated per same area of the light emitting section (emitted light flux surface) as the light source device. This is an advantageous configuration when a light source is configured by arranging diode elements. In addition, when an attempt is made to construct a light source device using the same number of light emitting diode elements, the arrangement configuration of the present embodiment reduces the area of the outgoing light beam surface as the light source device as compared with a simple arrangement on a plane. Can do.
[0027]
FIG. 6 shows a configuration in which the number of light emitting diode elements to be further arranged is increased by using the light source device 1 of the above embodiment. In addition to the arrangement configuration described above, a light emitting unit 14E (shaded 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 portion 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 outgoing light beam surface). In the φ55 ring, 24 light emitting diode elements 11 are arranged at intervals of 15 ° on the inner side and 30 light emitting diode elements 11 are arranged at intervals of 12 ° on the outer side. 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. As an example of the light source device of the projection display device 100, a light emitting diode element of each emission color of red (R), green (G), and blue (B) is used. The projection display device 100 includes a light emitting diode unit (R) 101 that emits red light, a light emitting diode unit (G) 102 that emits green light, a light emitting diode unit (B) 103 that emits blue light, and a condenser lens 104. , A color composition element 105, and a display device 106. Each light emitting diode unit 101-103 has the arrangement structure of the Example shown in FIG. 6, and is comprised by the light emitting diode element of each different color (R, G, B), respectively.
[0029]
Usually, 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 composition element 105. Here, components that can be arranged from the color composition element 105 to the display device 106 are omitted. The display device 106 is an apparatus that provides image information, and an LCD (liquid crystal display panel), a DMD (digital mirror device), or the like is used. The color lights from the light emitting diode units 101 to 103 are combined by the color combining element 105 to form illumination light, and are emitted in the direction of the display device 106 to be illuminated. The display device 106 is illuminated by the illumination light, and light that is image-modulated by image information provided by the display device 106 is projected onto a screen via a projection lens (not shown), thereby displaying an image.
[0030]
The embodiment of the present invention has been described above. The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. .
[0031]
【The invention's effect】
As is apparent from the above description, according to the light source device and the projection display device of the present invention, as a first point, the light emitted from the light emitting diode element is used through the reflective surface paired with the element. Since the area of the light source device light emitting part (outgoing light flux surface) can be reduced, the number of light emitting diode elements in the projection plane viewed from the light receiving side of the light source device is larger than in the case where the light emitting diode elements are simply arranged on a plane. It is possible to obtain an illumination light beam having a large luminance and a small light emitting area by arranging and integrating the light emitting diode elements.
[0032]
As a second point, the area of the light emitting section can be reduced as compared with the case where the same number of light emitting diode elements are used, and the entire apparatus using the light source device (projection display device) can be configured to be small. There is an effect that it is possible.
[0033]
Thirdly, since the area of the light emitting portion can be reduced, when the light source is configured using light emitting diode elements of red (R), green (G), and blue (B) emission colors, There is an effect that the entire apparatus using the light source can be made 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 reflective surface 12;
4 is a schematic view showing a light emitting unit on the upper surface of the light source device 1. FIG.
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 example for comparison.
FIGS. 6A and 6B are a top view, a cross-sectional view, and a schematic view of a light emitting unit showing a configuration when the light emitting diode utilization efficiency is further enhanced by using the light source device 1 in the embodiment of the present invention.
FIG. 7 is a diagram showing a configuration of a projection display apparatus 100 in 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]
DESCRIPTION OF SYMBOLS 1 Light source device 100 Projection type display apparatus 11 Light emitting diode element 12 Reflecting surface 13 Component 14 consisting 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 composition element 106 Display device (image information device)
201 Light-emitting diode element 202 Substrate

Claims (7)

Light emitting diode is a sequence in the counter-reflecting surface and the component is circular comprising a pair includes 2 a more circular unit circle radius are different, and a center arranged optical center emitting diode device optical axis,
Each of the light emitting diodes are arranged such that the optical axis thereof faces the device optical axis,
Wherein each reflective surface is disposed at an angle of reflection facing the light emitting portion of the light emitting diode forming a pair, and the light emitted from the light emitting diode to the device optical axis in the same direction,
Each of the circular units is arranged concentrically and hierarchically around the device optical axis so that a part of the circular unit overlaps another circular unit with respect to the direction of the device optical axis. A light source device having a structure in which light beams emitted from and reflected by the reflecting surface are not blocked from each other .   2. The light source device according to claim 1, wherein the light emitting diodes are arranged in a shape perpendicular to the optical axis of the device.   The light source device according to claim 1, wherein the reflection surface is disposed at a 45-degree relationship with the 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 so that an emitted light beam of the device becomes a parallel light beam.   5. The light source device according to claim 1, wherein the reflection surface is disposed in the immediate vicinity of a light emitting portion of the light emitting diode. A projection display device having a light source device using a light emitting diode, a display device that modulates an image using an emitted light beam from the light source device as illumination light, and a projection lens that projects light from the display device onto a screen. And
The light source device is
Emitting diode is a sequence in the counter-reflecting surface and the component is circular comprising a pair includes 2 a more circular unit circle radius are different, and a center arranged optical center emitting diode device optical axis,
Each of the light emitting diodes are arranged such that the optical axis thereof faces the device optical axis,
Wherein each reflective surface is disposed at an angle of reflection facing the light emitting portion of the light emitting diode forming a pair, and the light emitted from the light emitting diode to the device optical axis in the same direction,
Each of the circular units is arranged concentrically and hierarchically around the device optical axis so that a part of the circular unit overlaps another circular unit with respect to the direction of the device optical axis. A projection display device characterized in that light beams emitted from the light and reflected by the reflecting surface are not shielded 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 emission color of red (R), green (G), and blue (B), and emitted light beams of the respective colors from the three light source devices are synthesized by a color synthesizing element. Then, the projection display apparatus is configured to illuminate a display device as illumination light and project light modulated by the display device through a projection lens.

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