JP2005283837A - Lighting apparatus and projection type image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical lighting apparatus using a solid light source such as a light emitting diode, capable of easily attaining the miniaturization, and to provide a projection type image display apparatus not using a cross dichroic prism and a cross dichroic mirror. <P>SOLUTION: The lighting apparatus 2 is arranged in the projection type image display apparatus 1. The lighting apparatus 2 is constituted of three LED arrays 3R, 3G and 3B. The LED array is constituted by arranging a plurality of LEDs (light emitting diode) on the same plane. Each optical axis of outgoing light of the LED does not orthogonally cross the plane (LED arrangement plane). Red light emitted from the LED array 3R is reflected by the dichroic mirror 4G. Green light emitted from the LED array 3G is transmitted through the dichroic mirror 4G. The green light and the red light are guided to the dichroic mirror 4B. The green light and the red light are reflected by the dichroic mirror 4B. Blue light emitted from the LED array 3B is transmitted through the dichroic mirror 4B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination device and a projection display apparatus.

As an illuminating device used for a liquid crystal projector or the like, a lighting device such as a super high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like and a parabolic reflector that collimates the irradiation light is generally used. Further, in such an illuminating device, in order to reduce unevenness in the amount of light on the irradiation surface, an integration function by a pair of fly-eye lenses (a plurality of illumination areas of a predetermined shape sampled and formed in a plane by an optical device on an illumination object) Some have a function of superimposing and condensing). Furthermore, in recent years, it has been attempted to use a light emitting diode (LED) as a light source (see Patent Documents 1 and 2). Further, a configuration has been proposed in which red light from a red LED, green light from a green LED, and blue light from a blue LED are guided in desired directions using a cross dichroic prism (see Patent Document 2). .
JP-A-10-186507 JP 2002-189263 A

  In a configuration using a solid-state light source such as a light emitting diode, it has been a problem to obtain a practical illumination device and a projection display device. Further, the cross dichroic prism and the cross dichroic mirror are expensive, and problems such as vertical streaks appear in the video.

  In view of the circumstances described above, an object of the present invention is to provide a lighting device and a projection-type image display device that are easy to downsize and use a solid-state light source such as a light emitting diode without using a cross dichroic prism or a cross dichroic mirror. And

  In order to solve the above-described problems, the illumination device according to the present invention has a plurality of solid-state light emitting elements that emit colored light arranged in the same plane, and an oblique light axis is set in a direction that is not orthogonal to the plane. A specific light source comprising: an optical axis solid-state light emitting element array; and a dichroic mirror that is arranged in parallel or substantially parallel to the plane on the light emitting side of the oblique optical axis solid state light emitting element array and transmits the color light and reflects other color light The other specific light source that emits the other color light, another oblique optical axis solid light emitting element array that emits the other color light, and a plurality of solid light emitting elements that emit the other color light. Non-specific light having a vertical optical axis solid-state light-emitting element array whose emission axis is set perpendicular to the plane of arrangement of the solid-state light-emitting elements, and a plurality of solid-state light-emitting elements that emit the other color lights. Axial solid The light emitted from either the optical element array or the single solid-state light emitting element that emits the other color light is reflected by the dichroic mirror and guided to the illumination object. To do. Further, in this configuration, the specific light source or the other specific light source has a single solid-state light emitting element whose outgoing optical axis is inclined with respect to the dichroic mirror, instead of the oblique optical axis solid-state light emitting element array. (Hereinafter, these configurations are referred to as a first configuration in this section).

  With the above configuration, it is possible to guide each color light in a desired direction without using a cross dichroic mirror or a cross dichroic prism. The specific light source includes an oblique optical axis solid state light emitting element array, and a dichroic mirror is disposed in parallel or substantially parallel to the oblique optical axis solid state light emitting element array. Therefore, the specific light source becomes thin, and the lighting device can be miniaturized. The same applies to the case of having a single solid-state light emitting element array whose outgoing optical axis is oblique to the dichroic mirror.

  In the first configuration, the specific light source is irradiated with colored light from the other specific light source, the other oblique optical axis solid state light emitting element array, the vertical optical axis solid state light emitting element array, or a single solid state light emitting element. You may make it (henceforth a 2nd structure).

  In the second configuration, the specific light source and the other specific light source include a first specific light source and a second specific light source, and the oblique optical axis solid state light emitting element array or the vertical optical axis solid state light emitting element array or The first color light is emitted from a single solid-state light emitting element toward the first specific light source, the second color light is emitted from the first specific light source, and the first color light is reflected, and these The second specific light source provided at a position for receiving the first color light and the second color light may be configured to emit the third color light and reflect the first color light and the second color light. Good (hereinafter referred to as the third configuration).

  In the third configuration, the oblique optical axis solid state light emitting element array and the second specific light source are arranged in substantially the same plane, and the first light source includes the oblique optical axis solid state light emitting element array and the second specific light source. You may arrange | position diagonally with respect to a light source. Further, in the third configuration, the first specific light source and the second specific light source may be arranged inclined by 45 ° with respect to the vertical optical axis solid state light emitting element array.

  In the first configuration, the specific light source is provided on all or a part of four side surfaces of the rod integrator having a columnar structure or a cylindrical structure, and the emitted light of the specific light source is obliquely incident from the side surface of the rod integrator. (Hereinafter referred to as a fourth configuration).

  In the fourth configuration, the end surface located on the opposite side of the light emitting surface of the rod integrator may be a reflecting surface, and the specific light source may be arranged to irradiate light toward the reflecting surface. (Hereinafter referred to as the fifth configuration).

  In the fifth configuration, the vertical optical axis solid-state light emitting element array, the unspecified optical axis solid-state light emitting element array, or the single solid-state light emission on the light incident end face located on the opposite side to the light exit surface of the rod integrator An element is arranged, and the light incident end face transmits dichroic light that is transmitted by the vertical light axis solid-state light emitting element array, the unspecified light axis solid light-emitting element array, or a single solid light-emitting element, and reflects other color light. A mirror may be arranged, and the specific light source may be arranged to irradiate the other color light toward the light incident end face. In this configuration and the fifth configuration, the surface located on the opposite side of the light output surface of the rod integrator may have a non-flat surface shape.

  In the fourth configuration, the vertical optical axis solid state light emitting element array, the unspecified optical axis solid state light emitting element array, or a single solid state light emitting element is disposed on the light incident end surface located on the opposite side of the light emitting surface of the rod integrator. The specific light source may be arranged so as to irradiate colored light toward the light emitting surface. In this configuration, the two specific light sources that emit different colored lights are arranged so as to face each other with the rod integrator interposed therebetween, and the dichroic mirror of the specific light source on the opposite side is not irradiated as much as possible. Good.

  In the configuration after the fourth configuration, the two specific light sources may be arranged so as to face each other with the rod integrator interposed therebetween, and the two specific light sources may be configured to emit colored light whose wavelength regions are as far apart as possible.

  In the fourth configuration, toward the specific light source provided on the side surface of the rod integrator, the other specific light source provided on the other side surface facing the side surface, or the other oblique optical axis solid state light emitting device Color light may be emitted from the array (hereinafter referred to as a sixth configuration).

  In the sixth configuration, a specific light source that emits color light composed of two primary colors is provided on one side surface of the two opposite side surfaces of the rod integrator, and an oblique optical axis solid state light emitting element array is provided on the other side surface as the specific light source. On the other hand, it may be arranged so as to be diagonally opposite, and may be configured such that other color light is emitted from the oblique optical axis solid-state light emitting element array toward the specific light source (hereinafter referred to as a seventh configuration).

  In the seventh configuration, an additional set consisting of a specific light source that emits color light composed of the two primary colors and the oblique optical axis solid-state light emitting element array, or an equivalent additional set having a different combination of colors, or a part of these additional sets May be arranged using the other two side surfaces of the rod integrator. In this configuration and the seventh configuration, an additional set consisting of the specific light source that emits the color light composed of the two primary colors and the oblique optical axis solid-state light emitting element array, or an equivalent additional set having a different combination of colors, or A part may be arranged utilizing two side surfaces that have already been used.

  In the sixth configuration, as the specific light source and the other specific light source, the first specific light source and the second specific light source are provided, and the oblique optical axis solid state light emission is provided on one of two opposing side surfaces of the rod integrator. An element array and the second specific light source are arranged, and the first specific light source is arranged on the other surface so as to be obliquely opposite to the oblique optical axis solid-state light emitting element array and the second specific light source. First color light is emitted from the oblique optical axis solid-state light emitting element array toward the first specific light source, and second color light is emitted from the first specific light source and the first color light is emitted. The second specific light source provided at a position where the color light is reflected and receives the first color light and the second color light emits the third color light and reflects the first color light and the second color light. (Hereinafter, the eighth configuration and U).

  In the eighth configuration, an additional set consisting of the oblique optical axis solid-state light emitting element array, the first specific light source, and the second specific light source, or an equivalent additional set having different color combinations, or a part of these additional sets May be arranged using the other two side surfaces of the rod integrator. In this configuration and the eighth configuration, an additional set consisting of the oblique optical axis solid-state light emitting element array, the first specific light source, and the second specific light source, or equivalent additional sets having different color combinations, or of these additional sets A part may be arranged utilizing two side surfaces that have already been used.

  In the configuration after the sixth configuration, the vertical optical axis solid-state light emitting element array, the unspecified optical axis solid-state light emitting element array, or the single solid-state light emission on the light incident end face located on the opposite side of the light exit surface of the rod integrator An element may be arranged.

  Instead of the oblique optical axis solid state light emitting element array arranged on the side surface of the rod integrator, a single solid state light emitting element array whose outgoing optical axis is oblique with respect to the side surface may be provided.

  In the illuminating device having these configurations, when there are two specific light sources having a large calorific value or one specific light source and an oblique optical axis solid-state light emitting element array, they are arranged side by side rather than side by side. Good.

  The lighting device having these configurations may be configured to emit at least red light, green light, and blue light. A projection display apparatus including the illumination device includes one color light valve that receives light from the illumination device, and a projection lens that projects image light obtained through the color light valve. It is characterized by that.

  The illumination device having these configurations may be configured such that at least red light, green light, and blue light are sequentially emitted for a predetermined time. The projection display apparatus including the illumination device includes one light valve that receives light from the illumination device, a unit that supplies a video signal for each color to the light valve in synchronization with an emission timing of each color light, And a projection lens that projects image light obtained through the light valve.

  According to the present invention, there is an effect that it is possible to provide a practical and simple illuminating device and a projection display device using a solid light source such as a light emitting diode without using a cross dichroic prism or a cross dichroic mirror.

  Hereinafter, an illuminating device and a projection display apparatus according to embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing an optical system of a single-plate projection display apparatus 1. The projection display apparatus 1 is provided with an illumination device 2. The illuminating device 2 includes three LED arrays 3R, 3G, and 3B (hereinafter, when the individual LED arrays are indicated without being specified, the symbol “3” is used). The LED array 3R emits red light, the LED array 3G emits green light, and the LED array 3B emits blue light.

  The LED array 3 includes a plurality of LEDs (light emitting diodes) arranged in the same plane. The outgoing optical axis (principal ray) of each LED is set so as not to be orthogonal to the plane (LED arrangement plane). In this embodiment, the outgoing optical axis is inclined 45 ° with respect to the plane.

  A dichroic mirror 4G is provided close to the light emission side of the LED array 3G. The dichroic mirror 4G is provided in parallel with the LED arrangement plane in the LED array 3G. The dichroic mirror 4G is configured to transmit green light and reflect other color light. A dichroic mirror 4B is provided close to the light emission side of the LED array 3B. The dichroic mirror 4B is provided in parallel with the LED arrangement plane in the LED array 3B. The dichroic mirror 4B is configured to transmit blue light and reflect other color light (hereinafter, the symbol “4” is used to indicate each dichroic mirror without specifying it).

  In the configuration of FIG. 1, the LED arrays 3R, 3G, and 3B are the oblique optical axis solid state light emitting element arrays described in the claims, and the combination of the LED array 3G and the dichroic mirror 4G, and the combination of the LED array 3B and the dichroic mirror 4B. Corresponds to the specific light source described in the claims. The specific light source may have a single solid-state light emitting element whose outgoing optical axis is inclined with respect to the dichroic mirror 4 instead of the oblique optical axis solid-state light emitting element array 3. The same applies to other configuration examples shown in FIGS. 2 to 11 described later.

  The LED array 3R and the LED array 3B are provided side by side in the same plane. On the other hand, the LED array 3G is disposed obliquely and parallel to the LED array 3R and the LED array 3B. The amount of heat generated by the LED array 3G and the LED array 3B is larger than that of the LED array 3R. As described above, the LED array 3G and the LED array 3B that generate a large amount of heat are arranged so as to be spaced apart from each other, so that heat dissipation is performed satisfactorily and temperature rise is suppressed.

  The LED array 3R is arranged to emit red light toward the dichroic mirror 4G. The dichroic mirror 4G is disposed so as to reflect the red light toward the dichroic mirror 4B. The LED array 3G is arranged to emit green light toward the dichroic mirror 4B. The dichroic mirror 4B is disposed so as to reflect the red light and the green light toward the reflective image display panel 5. The LED array 3 </ b> B is disposed so as to emit blue light toward the reflective video display panel 5. A lens 6 (lens array for collimating the emitted light of each LED) or the like is provided on the optical path of each color light as necessary. Each LED may include a collimating lens. Further, an integrator lens 7 and a condenser lens 8 are provided on the optical path between the dichroic mirror 4B and the reflective image display panel 5.

  The integrator lens 7 is composed of a pair of lens groups (fly eye lenses), and each pair of lenses guides incident light to the entire surface of the reflective image display panel (reflective light valve) 5. Further, as the reflective image display panel 5, a reflective liquid crystal panel or a mirror device configured to individually drive a large number of micromirrors is used. The light (image light) modulated by the reflective image display panel 5 is enlarged and projected by a projection lens (not shown). When a reflective liquid crystal panel is used, a polarization conversion device is preferably provided on the light exit side of the integrator lens 7. Of course, a transmissive image display panel (transmissive light valve) may be provided instead of the reflective image display panel.

  The polarization converter is constituted by a polarization beam splitter array (hereinafter referred to as a PBS array). The PBS array includes a polarization separation film and a phase difference plate (1 / 2λ plate). Each polarization separation film of the PBS array passes, for example, P-polarized light out of the light from the integrator lens 14 and changes the optical path of S-polarized light by 90 °. The S-polarized light whose optical path has been changed is reflected by an adjacent polarization separation film, converted into P-polarized light by the retardation plate provided on the front side (light emitting side), and emitted. On the other hand, the P-polarized light transmitted through the polarization separation film is emitted as it is. That is, in this case, almost all light is converted to P-polarized light. In the above example, the configuration for converting all the light into P-polarized light has been described. However, the configuration may be such that all the light is converted into S-polarized light by providing the phase difference plate position at the P-polarized light emission position.

  Next, the configuration shown in FIG. 2A will be described. The projection display apparatus shown in FIG. 2A includes an illumination device 21. The illumination device 21 includes LED arrays 3R, 3G, and 3B, dichroic mirrors 4G and 4B, and a rod integrator 11A made of quadrangular prism-shaped glass. LED arrays 3R and 3B are provided on one surface of the two opposite side surfaces of rod integrator 11A, and LED array 3G is provided on the other surface. The arrangement relationship of the LED arrays 3R, 3G, 3B and the dichroic mirrors 4G, 4B is the same as in FIG. 1, and each color light is superimposed by passing through the rod integrator 11A. In the configuration of FIG. 2A, a transmissive liquid crystal display panel 12 is provided on the light exit surface side of the rod integrator 11A. The aspect ratio of the light exit surface of the rod integrator 11 </ b> A is substantially matched to the aspect ratio of the liquid crystal display panel 12. An appropriate lens is provided between the light emitting surface and the liquid crystal display panel 12. Instead of the oblique optical axis solid state light emitting element array 3 arranged on the side surface of the rod integrator, a single solid state light emitting element whose outgoing optical axis is inclined with respect to the side surface of the rod integrator may be provided. The same applies to the configuration examples of FIGS. 2B and 3A and 3B described later.

  The projection display apparatus shown in FIG. 2B includes an illumination device 21 ′. In the illumination device 21, the illumination device 21 ′ is arranged with another LED array 3R facing the LED array 3R, another LED array 3G and a dichroic mirror 4G are arranged facing the LED array 3G, Another LED array 3B and dichroic mirror 4B are arranged facing the LED array 3B. That is, another set including the LED arrays 3R, 3G, 3B and the dichroic mirrors 4G, 4B is provided using the same two side surfaces. With such a configuration, a large number of LED arrays can be arranged on the side surface of the rod integrator, and high luminance can be achieved. Furthermore, another set or two sets may be provided using the other two side surfaces. In this case, since the emitted light of the LED is wide, the light utilization efficiency may be lowered, but the number of LED arrays is increased, so that an improvement in luminance can be expected. Considering the spread of the emitted light of each LED, the arrangement interval of the LED arrays may be widened. Further, the dichroic mirror at a position closer to the light emitting end side may be enlarged. The size of the LED array and the dichroic mirror need not be the same. The arrangement order of the LED arrays 3R, 3G, and 3B does not have to be the same in all sets. In this case, a dichroic mirror 4R (not shown) that transmits red light and reflects other color light may be provided as necessary. Moreover, you may arrange | position a part of set instead of the same set.

  Next, the configuration shown in FIG. 3A will be described. The projection display apparatus shown in FIG. 3A includes an illumination device 22. The illumination device 22 includes LED arrays 3Y and 3B, a dichroic mirror 4B, and a rod integrator 11A made of quadrangular prism-shaped glass. The LED array 3Y is a mixture of LEDs that emit red light and LEDs that emit green light. The outgoing optical axis of each LED is not orthogonal to the LED placement surface. That is, the LED array 3Y is an oblique optical axis LED array. The LED array 3Y is provided on one surface of the two opposite side surfaces of the rod integrator 11A, and the LED array 3B is provided obliquely on the other surface. A dichroic mirror 4B is provided on the light emitting side of the LED array 3B. Yellow light from the LED array 3Y passes through the rod integrator 11 and is reflected by the dichroic mirror 4B. Blue light emitted from the LED array 3B passes through the dichroic mirror 4B. In such a configuration, the number of reflections of blue light and green light in the rod integrator can be increased compared to the configuration of FIG.

  The configuration shown in FIG. 3B includes an illumination device 22 ′. The illumination device 22 'is the illumination device 22 in which another LED array 3Y is arranged facing the LED array 3Y, and another LED array 3B and dichroic mirror 4B are arranged facing the LED array 3B. It is. That is, another set including the LED arrays 3Y and 3B and the dichroic mirror 4B is provided using the same two side surfaces. With such a configuration, a large number of LED arrays can be arranged on the side surface of the rod integrator, and high luminance can be achieved. Furthermore, another set or two sets may be provided using the other two side surfaces. In this case, the light emitted from the LED spreads, and thus the light utilization efficiency may be lowered. However, since the number of LED arrays increases, an improvement in luminance can be expected. Considering the spread of the emitted light of each LED, the arrangement interval of the LED arrays may be widened. Further, the dichroic mirror at a position closer to the light emitting end side may be enlarged. The size of the LED array and the dichroic mirror need not be the same. The arrangement order of the LED array 3 does not have to be the same in all sets. Not only the combination of the LED arrays 3Y and 3B, but, for example, a combination in which a blue LED and a green LED are mixed and an LED array that emits cyan light is provided, and an LED array 3R and a dichroic mirror 4R are provided. Moreover, you may arrange | position a part of set instead of the same set.

  Next, the configuration shown in FIG. 4 will be described. The projection display apparatus shown in FIG. The illumination device 28 includes an LED array 3′G, LED arrays 3R and 3B, dichroic mirrors 4R and 4B, and a rod integrator 11A made of quadrangular prism-shaped glass. The LED array 3′G is different from the LED array 3G. The outgoing optical axis of the LED array 3′G is orthogonal to the LED arrangement plane. That is, a vertical optical axis LED array. The LED array 3R is provided on one surface of the two opposing side surfaces of the rod integrator 11A, and the LED array 3B is provided diagonally on the other surface. A dichroic mirror 4R is provided on the light emitting side of the LED array 3R. A dichroic mirror 4B is provided on the light emitting side of the LED array 3B. The LED array 3′G is provided on the light incident end face of the rod integrator 11A, and the light emitted from the LED array 3′G is incident from the light incident end face. The red light from the LED array 3R passes through the rod integrator 11A and is reflected by the dichroic mirror 4B. Blue light emitted from the LED array 3B passes through the dichroic mirror 4B. Also in the configuration of FIG. 4, as in FIG. 2B and FIG. 3B, the same set as the side arrangement set, an equivalent set different in color, or a part of the set may be used side-by-side or other Can be placed on two sides.

  Next, the configuration shown in FIGS. 5A and 5B will be described. The projection display apparatus shown in FIG. The illumination device 23 includes two LED arrays 3R, one LED array 3'G, two LED arrays 3B, two dichroic mirrors 4R, two dichroic mirrors 4B, and a quadrangular prism shape. And a rod integrator 11B made of glass. The LED array 3′G is different from the LED array 3G. The outgoing optical axis of the LED array 3′G is orthogonal to the LED arrangement plane. That is, a vertical optical axis LED array. The dichroic mirror 4R transmits red light and reflects other color light, and is provided in parallel with the LED arrangement plane in the LED array 3R.

  An LED array 3'G is disposed on the light incident end surface located on the opposite side of the light output surface of the rod integrator 11B. The LED arrays 3R and 3B are provided on the side surface in the vicinity of the light incident end surface. Further, as shown in FIG. 5B, the LED array 3R and the LED array 3B are arranged to face each other. The outgoing optical axis (principal ray) in the LED array 3R is directed closer to the light emitting surface, and the optical axis angle (principal ray angle) is set so that the emitted red light does not enter the dichroic mirror 4B as much as possible. Has been. The outgoing optical axis (principal ray) in the LED array 3B is also directed toward the light outgoing plane, and the optical axis angle (principal ray angle) is set so that the emitted blue light does not enter the dichroic mirror 4R as much as possible. Yes.

  With the configuration shown in FIG. 5, light incident from the end face can be used in addition to incident light from the side face of the rod integrator, so that high brightness can be achieved.

  Next, the configuration shown in FIGS. 6A and 6B will be described. In the configuration of FIG. 5 described above, the output optical axes of the LED arrays 3R and 3B are directed closer to the light output surface of the rod integrator 11B, whereas in the configuration of FIG. 6, the output optical axes of the LED arrays 3R and 3B are rods. It is directed to the light incident end face of the integrator 11C. A dichroic mirror 4G is provided between the light incident end face of the rod integrator 11C and the LED array 3'G.

  With the configuration of FIG. 6, the number of reflections of light in the rod integrator 11C increases due to the folding of light using the light incident end face, and the total length of the rod integrator 11C can be shortened accordingly. . Therefore, it can contribute to miniaturization of the projection display apparatus.

  FIG. 7 is a graph showing the light intensity distribution of the red light emitted from the LED array 3R and the blue light emitted from the LED array 3B. The dichroic mirror reflects, for example, light having an upper wavelength and transmits light having a lower wavelength with an arbitrarily set wavelength value as a boundary. If the color light to be transmitted and the color light to be reflected are mixed in the vicinity of the boundary, the light use efficiency is lowered. In the configuration of FIG. 6, red light is incident on the dichroic mirror 4B and blue light is incident on the dichroic mirror 4R. As can be seen from the graph, the wavelength range of red light and blue light is as far as possible. It becomes colored light. Therefore, loss is reduced in the reflection of red light by the dichroic mirror 4B and the reflection of blue light by the dichroic mirror 4R, and the light utilization efficiency is improved. That is, it is preferable that the two LED arrays 3 arranged to face each other emit colored light whose wavelength regions are as far apart as possible.

  Next, the configuration shown in FIGS. 8A and 8B will be described. The projection display apparatus shown in FIG. The illumination device 25 includes one LED array 3R, one LED array 3G, one LED array 3B, one dichroic mirror 4R, one dichroic mirror 4G, and one dichroic mirror. 4B and a rod integrator 11D made of square columnar glass. Each LED array and each dichroic mirror is arranged using three side surfaces of the rod integrator 11D. The end face located on the opposite side of the light emitting end face of the rod integrator 11D is a reflecting face (a mirror face that reflects each color light). The LED arrays 3R, 3G, 3B are provided on the side surface in the vicinity of the mirror surface. Further, as shown in FIG. 8B, the LED array 3R and the LED array 3B are arranged on opposite side surfaces, and the LED array 3G is arranged on the other side surface.

  With the configuration of FIG. 8, although light cannot be incident from the end face, the number of reflections of light within the rod integrator 11D increases due to the return of light using the mirror surface. Can be shortened. Therefore, it can contribute to miniaturization of the projection display apparatus. Similarly to the configuration of FIG. 6, the two LED arrays 3 arranged to face each other emit color light whose wavelength regions are as far apart as possible, thereby suppressing light reflection loss due to the dichroic mirror. Of course, the configuration is not limited to this, and for example, an LED array that emits yellow light may be used instead of the LED array 3R. Similarly, in the configuration of FIG. 5, for example, an LED array that emits yellow light can be used instead of the LED array 3 </ b> R.

  The illumination device 25 ′ of the projection display apparatus shown in FIG. 9 has a configuration in which the mirror surface is a curved surface in the configuration of FIG. With this configuration, red light is less likely to be incident on the dichroic mirror 4B, so that attenuation (absorption) of red light by the dichroic mirror 4B can be suppressed as much as possible, and blue light is less likely to be incident on the dichroic mirror 4R. Therefore, attenuation (absorption) of blue light by the dichroic mirror 4R can be suppressed as much as possible. In addition, it is possible to obtain the same effect as that of the curved surface by making the mirror surface a non-flat surface as well as a curved surface. The outgoing optical axes of the LEDs in the LED array 3 do not have to be parallel to each other. In the configuration shown in FIG. 6 as well, the light incident end surface of the rod integrator 11 can be a non-flat surface.

  The illumination device 26 shown in FIG. 10 includes an LED array 3′R, an LED array 3G, an LED array 3B, a dichroic mirror 4G, and a dichroic mirror 4B. The LED array 3′R is different from the LED array 3R. The outgoing optical axis of the LED array 3′R is orthogonal to the LED arrangement plane. That is, the LED array 3′R is a vertical optical axis LED array. A dichroic mirror 4G is provided on the light emitting side of the LED array 3'R so as to be inclined by 45 ° with respect to the outgoing optical axis of the LED array 3'R. An LED array 3G is provided in parallel with the dichroic mirror 4G. The outgoing optical axis of the LED array 3G is inclined 45 ° with respect to the dichroic mirror 4G.

  The red light emitted from the LED array 3′R has its optical path changed by 90 ° by the dichroic mirror 4G. The green light emitted from the LED array 3G passes through the dichroic mirror 4G and travels in parallel with the red light reflected by the dichroic mirror 4G. A dichroic mirror 4B is provided at a position for receiving red light and green light, and an LED array 3B is provided in parallel with the dichroic mirror 4B. The outgoing optical axis of the LED array 3B is inclined 45 ° with respect to the dichroic mirror 4B.

  The optical paths of red light and green light are changed by 90 ° by the dichroic mirror 4B. The blue light emitted from the LED array 3B passes through the dichroic mirror 4B and travels in parallel with the red light and green light reflected by the dichroic mirror 4B. It is preferable to provide an integrator lens or a rod integrator at a position where these blue light, red light, and green light are received.

  The illumination device 27 shown in FIG. 11 includes an LED array 3′Y, an LED array 3B, and a dichroic mirror 4B. The LED array 3′Y is different from the LED array 3Y. The outgoing optical axis of the LED array 3'Y is orthogonal to the LED arrangement plane. That is, the LED array 3′Y is a vertical optical axis LED array. A dichroic mirror 4B is provided on the light emission side of the LED array 3′Y at an angle of 45 ° with respect to the emission optical axis of the LED array 3′Y. An LED array 3B is provided in parallel with the dichroic mirror 4B. The outgoing optical axis of the LED array 3B is inclined 45 ° with respect to the dichroic mirror 4B.

  The yellow light emitted from the LED array 3′Y has its optical path changed by 90 ° by the dichroic mirror 4B. The blue light emitted from the LED array 3B passes through the dichroic mirror 4B and travels in parallel with the yellow light reflected by the dichroic mirror 4B. It is preferable to provide an integrator lens or a rod integrator at a position for receiving these colored lights.

  The display panels 5 and 12 described above have a structure with an RGB color filter or a structure without an RGB color filter. When the display panels 5 and 12 having a structure including the RGB color filters are used, the LED array 3 is simultaneously turned on to guide white light to the display panels 5 and 12. When a display panel having a structure without the RGB color filter is used, the LED arrays 3R, 3G, and 3B (3′R, 3′G, and 3′B) are lighted sequentially in a time-division manner for a predetermined time. Video signals of each color are supplied to the display panels 5 and 12 in synchronization with lighting timing for a predetermined time. An LED array (for example, LED arrays 3Y, 3'Y, etc.) in which LEDs emitting different color lights are mixed can be lit for each color LED.

  Each LED in the LED array 3 may include a lens unit for parallel light. It is possible to employ an LED array in which LED chips are arranged in an array and lens cells (for example, for parallel light) are arranged on the light emission side of each LED chip by a mold or the like. Further, instead of the vertical optical axis LED array, a single LED or an unspecified optical axis LED array may be used. The unspecified optical axis LED array is composed of a plurality of LEDs and the output optical axis is unspecified (vertical and non-vertical may be mixed). In addition to LEDs, other light emitting elements such as organic or inorganic electroluminescence can be used.

  A polarization conversion device may be provided on the light exit side of the rod integrator. In this case, the polarization conversion device includes a single PBS (polarization beam splitter) corresponding to the size of the light output portion of the rod integrator, a mirror provided in parallel with the polarization separation film in the PBS, and the mirror or PBS. What is necessary is just to provide the phase difference plate provided in the light-projection side. However, in this case, the size of the light emitting portion of the polarization conversion device is twice the size of the light emitting portion of the rod integrator 3. Accordingly, it is desirable that the overall shape of the light emitting part of the polarization conversion device substantially matches the aspect ratio of the liquid crystal panel. In this case, assuming that the aspect ratio of the liquid crystal panel is A: B, the aspect ratio of the light emitting portion of the rod integrator 3 is, for example, A: B / 2.

  The rod integrator is not limited to a non-hollow glass rod integrator. A hollow rod integrator (square cylindrical rod integrator) whose inner surface is a mirror surface may be used. When a hollow rod integrator is used, the location where the LED array or the dichroic mirror is arranged is not a mirror surface. Even when a non-hollow rod integrator is used, the place where the LED array and the dichroic mirror are arranged is set so that the emitted light easily enters the rod.

It is explanatory drawing which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention. It is explanatory drawing which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention, The figure (a) shows the structure provided with one set of light sources using the two side surfaces which a rod integrator opposes. FIG. 5B shows a configuration including two sets of light sources using two opposing side surfaces of the rod integrator. It is explanatory drawing which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention, The figure (a) shows the structure provided with one set of light sources using the two side surfaces which a rod integrator opposes. FIG. 5B shows a configuration including two sets of light sources using two opposing side surfaces of the rod integrator. It is the figure which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention. It is the figure which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention, the figure (a) is a side view, and the figure (b) is a front view. It is the figure which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention, the figure (a) is a side view, and the figure (b) is a front view. It is the graph which showed light intensity distribution of red light and blue light. It is the figure which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention, the figure (a) is a side view, and the figure (b) is a front view. It is explanatory drawing which mainly showed the illuminating device in the projection type video display apparatus of embodiment of this invention. It is explanatory drawing which showed the illuminating device in the projection type video display apparatus of embodiment of this invention. It is explanatory drawing which showed the illuminating device in the projection type video display apparatus of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projection type image display apparatus 2 Illumination apparatus 21 Illumination apparatus 21 'Illumination apparatus 22 Illumination apparatus 22' Illumination apparatus 23 Illumination apparatus 24 Illumination apparatus 25 Illumination apparatus 25 'Illumination apparatus 26 Illumination apparatus 27 Illumination apparatus 28 Illumination apparatus 3 LED array (diagonal) optical axis)
3 'LED array (vertical optical axis)
4 Cross dichroic mirror

Claims (27)

An oblique optical-axis solid-state light-emitting element array in which a plurality of solid-state light-emitting elements that emit colored light are arranged in the same plane and an outgoing optical axis is set in a direction that is not orthogonal to the plane, and the oblique optical-axis solid-state light-emitting element array At least one specific light source including a dichroic mirror that is arranged in parallel or substantially parallel to the plane on the light emitting side of the light and transmits the color light and reflects other color light,
Another specific light source that emits the other color light, another oblique optical axis solid light emitting element array that emits the other color light, and a plurality of solid light emitting elements that emit the other color light, and the emission optical axis is a solid light emitting element A vertical optical axis solid state light emitting element array set perpendicular to the arrangement plane of the above, an unspecified optical axis solid state light emitting element array composed of a plurality of solid state light emitting elements that emit the other color light, and an output optical axis being unspecified, Alternatively, the illumination apparatus is configured such that light emitted from any one of the single solid-state light emitting elements that emit the other color light is reflected by the dichroic mirror and guided to the illumination object. 2. The illumination device according to claim 1, wherein the specific light source or the other specific light source is a single solid-state light emission whose output optical axis is inclined with respect to the dichroic mirror, instead of the oblique optical axis solid-state light emitting element array. An illumination device comprising an element. 3. The lighting device according to claim 1, wherein the other specific light source, the other oblique optical axis solid light emitting element array, the vertical optical axis solid light emitting element array, or a single light source are directed toward the specific light source. An illumination device characterized by being irradiated with colored light from a solid-state light emitting element. 4. The illumination device according to claim 3, wherein the specific light source and the second specific light source include a first specific light source and a second specific light source, and the oblique optical axis solid-state light emitting element array or the vertical optical axis solid-state light emission. The first color light is emitted from the element array toward the first specific light source, the second color light is emitted from the first specific light source, and the first color light is reflected, and these first color lights are reflected. The second specific light source provided at a position for receiving the second color light emits the third color light and reflects the first color light and the second color light. 5. The illumination device according to claim 4, wherein the oblique optical axis solid-state light emitting element array and the second specific light source are arranged in substantially the same plane, and the first light source includes the oblique optical axis solid state light emitting element array and A lighting device, wherein the lighting device is disposed obliquely with respect to the second light source. 5. The illuminating device according to claim 4, wherein the first specific light source and the second specific light source are arranged at an angle of 45 [deg.] With respect to the vertical optical axis solid state light emitting element array. 3. The lighting device according to claim 1, wherein the specific light source is provided on all or a part of four side surfaces of a rod integrator having a columnar structure or a cylindrical structure, and light emitted from the specific light source is a side surface of the rod integrator. The illumination device is configured to be incident obliquely from the side. The lighting device according to claim 7, wherein an end surface located on a side opposite to a light emission surface of the rod integrator is a reflection surface, and the specific light source is disposed so as to irradiate light toward the reflection surface. A lighting device characterized by comprising: 8. The illumination device according to claim 7, wherein the vertical optical axis solid-state light emitting element array or the unspecified optical axis solid-state light emitting element array or the single light is disposed on the light incident end face located on the opposite side of the light exit surface of the rod integrator. The solid-state light emitting element is arranged, and the light incident end face transmits the color light emitted from the vertical optical axis solid-state light emitting element array, the unspecified optical axis solid-state light emitting element array, or the single solid-state light emitting element, and the other color lights are transmitted. A dichroic mirror that reflects is disposed, and the specific light source is disposed to irradiate the other color light toward the light incident end face. 10. The lighting device according to claim 8, wherein a surface of the rod integrator located on a side opposite to the light emitting surface has a non-flat surface shape. 11. 8. The illumination device according to claim 7, wherein the vertical optical axis solid-state light emitting element array, the non-specific optical axis solid-state light emitting element array, or a single solid is disposed on a light incident end surface located on the opposite side of the light exit surface of the rod integrator. A light emitting element is disposed, and the specific light source is disposed so as to emit colored light toward the light emitting surface. 12. The illumination device according to claim 11, wherein two specific light sources that emit different colored lights are arranged so as to face each other with the rod integrator interposed therebetween, so that the emitted light from each other is not irradiated to the dichroic mirror of the specific light source on the opposite side as much as possible. A lighting device characterized in that it is configured as follows. The lighting device according to any one of claims 7 to 12, wherein two specific light sources are arranged so as to face each other with a rod integrator interposed therebetween, and the two specific light sources emit colored light whose wavelength regions are as far apart as possible. A lighting device characterized by the above. 8. The illumination device according to claim 7, wherein the other specific light source provided on the other side surface facing the side surface or the other oblique optical axis toward the specific light source provided on the side surface of the rod integrator. An illumination device, wherein colored light is irradiated from a solid state light emitting element array. 15. The illumination device according to claim 14, wherein a specific light source that emits color light composed of two primary colors is provided on one side surface of two opposite side surfaces of the rod integrator, and an oblique optical axis solid state light emitting element array is provided on the other side surface. An illumination device, characterized in that the illumination device is provided obliquely with respect to a specific light source, and is irradiated with other colored light from the oblique optical axis solid-state light emitting element array toward the specific light source. 16. The illuminating device according to claim 15, wherein an additional set consisting of a specific light source that emits color light obtained by combining the two primary colors and the oblique optical axis solid-state light emitting element array, or equivalent additional sets having different color combinations, or these additional sets. A part of the lighting device is arranged using the other two side surfaces of the rod integrator. 17. The illumination device according to claim 15 or 16, wherein an additional set comprising a specific light source that emits color light obtained by combining the two primary colors and the oblique optical axis solid-state light emitting element array, or an equivalent additional set having different color combinations. Or the lighting apparatus characterized by arrange | positioning a part of these additional sets using two side surfaces already used. 15. The illumination device according to claim 14, wherein the specific light source and the other specific light source include a first specific light source and a second specific light source, and the oblique light is provided on one of two opposing side surfaces of the rod integrator. An axial solid state light emitting element array and the second specific light source are disposed, and the first specific light source is obliquely opposite to the oblique optical axis solid state light emitting element array and the second specific light source on the other surface. The first color light is emitted from the oblique optical axis solid-state light emitting element array toward the first specific light source, and the second color light is emitted from the first specific light source and the The second specific light source provided at a position where the first color light is reflected and receives the first color light and the second color light emits the third color light and the first color light and the second color light. Device characterized by reflecting light 19. The lighting device according to claim 18, wherein an additional set comprising the oblique optical axis solid-state light emitting element array, the first specific light source, and the second specific light source, or an equivalent additional set having different color combinations, or these additional sets. A part of the lighting device is arranged using the other two side surfaces of the rod integrator. 20. The illumination device according to claim 18 or 19, wherein an additional set comprising the oblique optical axis solid-state light emitting element array, the first specific light source, and the second specific light source, or an equivalent additional set having a different color combination. Or the lighting apparatus characterized by arrange | positioning a part of these additional sets using two side surfaces already used. 21. The illumination device according to claim 14, wherein the vertical optical axis solid-state light emitting element array or the unspecified optical axis solid-state light emission is provided on a light incident end surface located on a side opposite to a light emitting surface of the rod integrator. An illumination device comprising an element array or a single solid state light emitting element. The lighting device according to any one of claims 14 to 21, wherein instead of the oblique optical axis solid-state light emitting element array disposed on the side surface of the rod integrator, the output optical axis is inclined with respect to the side surface. An illumination device comprising the solid-state light-emitting element array. The lighting device according to any one of claims 1 to 22, wherein when there are two specific light sources or one specific light source and an oblique optical axis solid state light emitting element array having a large calorific value, these are arranged side by side. A lighting device characterized in that the lighting device is arranged not facing each other but spaced apart. The lighting device according to any one of claims 1 to 23, wherein the lighting device is configured to emit at least red light, green light, and blue light. 24. The lighting device according to claim 1, wherein at least red light, green light, and blue light are sequentially emitted for a predetermined time. 25. A lighting device according to claim 24, a color light valve that receives light from the lighting device, and a projection lens that projects image light obtained by passing through the color light valve. A projection-type image display device. 26. The lighting device according to claim 25, one light valve for receiving light from the lighting device, means for supplying a video signal for each color to the light valve in synchronization with an emission timing of each color light, and the light A projection-type image display device comprising: a projection lens that projects image light obtained by passing through a bulb.

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