JP4302164B2 - Illumination device and projection display device - Google Patents

Description

  The present invention relates to an illuminating device and a projection display apparatus including a plurality of solid-state light sources having different directivities of emitted light and an optical unit that reduces the angle of dispersion of incident light.

  2. Description of the Related Art Conventionally, there is known a projection display apparatus that includes a plurality of solid-state light sources that emit different color lights such as RGB (red, green, and blue) colors and that projects an image with colored light emitted from the solid-state light sources (for example, Patent Documents). 1).

  FIG. 15 shows an example of the above-described projection display apparatus. As shown in FIG. 15, the projection display apparatus includes a multi-chip type light source 10 having a plurality of solid light sources, a tapered rod integrator 21 for guiding each color light emitted from the plurality of individual light sources to the display panel 30, and A display panel 30 that modulates incident color light and emits it as video light, and a projection lens unit 110 that projects the video light onto a screen or the like are provided.

In general, in the projection display apparatus having the above-described configuration, it is desirable that the light source 10 be arranged as close to the tapered rod integrator 21 as possible so as not to miss emitted color light. Therefore, normally, the light source 10 and the taper type rod integrator 21 are provided with an interval for avoiding transmission of vibration, heat, and the like, but are arranged with a space as narrow as possible (for example, about 1 mm).
Japanese Patent Laid-Open No. 2000-112031

  By the way, the color light emitted from the solid light source has a higher light utilization efficiency in the optical system as the color light has a smaller dispersion angle. Therefore, when an LED (light emitting diode) is used as a solid light source, the directivity of colored light emitted from the solid light source is improved by using a mold lens, a photonic crystal, or the like.

  However, when a red LED that emits red light, a green LED that emits green light, or a blue LED that emits blue light is used as the plurality of solid light sources, it is difficult to make the directivity of the emitted light uniform.

Specifically used, the red LED emitting red light, whereas typically Al I NGAP system is used as a material, the green LED and the blue LED emits green light and blue light, as InGaN system material It has been. Therefore, for example, a red LED has a dispersion angle distribution as shown in FIG. 16A, while a green LED and a blue LED have a dispersion angle distribution as shown in FIG. There is a large difference in light intensity between a dispersion angle range of ° to -30 ° and a dispersion angle range of 30 ° to 60 °.

  As described above, in the projection display apparatus using each color LED having different directivity, when each color light is guided to the display panel 30 by the optical system having the same structure, the illuminance distribution (for each color light on the display panel 30 ( Brightness deviation in the illumination plane), dispersion angle distribution (distribution state shown in FIGS. 16A and 16B), dispersion angle in-plane distribution (dispersion angle distribution at each location in the irradiation plane), etc. Differences occur, color unevenness occurs in the projected image on the screen, and the image quality is greatly degraded.

  Accordingly, the present invention has been made in view of the above points, and provides an illumination device and a projection display device that suppresses occurrence of color unevenness in a projection image while using a plurality of solid-state light sources having different directivities. For the purpose.

  The illumination device according to the first feature emits a first solid-state light source (green LED 10b or blue LED 10c) that emits light having a first directivity, and light having a second directivity wider than the first directivity. A first arrangement member (for example, a core board member 11) provided with a second solid state light source (red LED 10a) and a first arrangement surface (for example, arrangement surface F1) on which the first solid light source is arranged; A second arrangement member (for example, a core board member 11) provided with a second arrangement surface (for example, arrangement surface F2) on which the second solid light source is arranged, light emitted from the first solid light source, and An optical unit (for example, a taper-type rod integrator 21) that reduces the angle of dispersion of the light emitted from the second solid-state light source. The wavelength of light (for example, green light or blue light) emitted from the first solid light source is different from the wavelength of light (for example, red light) emitted from the second solid light source. The optical unit includes a first incident surface (for example, an incident surface 21a) on which light emitted from the first solid light source is irradiated, and a second incident surface on which light emitted from the second solid light source is irradiated. (For example, the incident surface 21a). The first arrangement surface and the first incident surface are opposed to each other, and the second arrangement surface and the second incident surface are opposed to each other. The distance from the second placement surface to the second entrance surface is longer than the distance from the first placement surface to the first entrance surface.

  According to such a feature, in the lighting device, the second arrangement surface on which the second solid light source is arranged rather than the distance from the first arrangement surface on which the first solid light source is arranged to the first incident surface of the optical unit. The distance from the second incident surface of the optical unit is longer. Therefore, in the illumination device according to the related art, light having a large dispersion angle emitted from the second solid light source is irradiated on the second incident surface. In the illumination device described above, the light is emitted from the second solid light source. Of the second directivity, the light having a small dispersion angle is irradiated onto the second incident surface of the optical unit, and the light having a large dispersion angle is prevented from being irradiated onto the second incident surface. In other words, the lighting device has a dispersion angle distribution of the second directivity light irradiated from the second solid light source to the second incident surface, and the first directivity irradiated from the first solid light source to the first incident surface. The difference from the dispersion angle distribution of the light can be reduced. According to such a feature, the lighting device can suppress the occurrence of color unevenness in the projected image while using a plurality of solid light sources having different directivities. In this specification, when the dispersion angle shown in FIGS. 16A to 16B is “θz”, the absolute value “| θz |” of the dispersion angle “θz” is large. For example, the closer to “90 °”), the larger the dispersion angle. The smaller the angle of “| θz |” (for example, the closer to “0 °”), the smaller the dispersion angle.

  1st characteristic mentioned above WHEREIN: The said 2nd arrangement | positioning member is provided with the recessed part (recessed part 12) which has a bottom face as said 2nd arrangement | positioning surface.

  According to such a feature, in the illumination device, since the second arrangement surface is provided on the bottom surface of the recess, the distance from the first arrangement surface where the first solid light source is arranged to the first incident surface of the optical unit is determined. In addition, the distance from the second arrangement surface on which the second solid light source is arranged to the second incident surface of the optical unit can be made longer. Therefore, in the illumination device, light having a large dispersion angle out of the second directional light emitted from the second solid-state light source is suppressed from irradiating the second incident surface, and the second incident surface is irradiated. The difference between the dispersion angle distribution of the emitted light and the dispersion angle distribution of the light applied to the first incident surface can be reduced. According to such a feature, the lighting device can suppress the occurrence of color unevenness in the projected image while using a plurality of solid light sources having different directivities.

  1st characteristic mentioned above WHEREIN: The inclined surface of the said recessed part is comprised by the reflective surface which reflects the light radiate | emitted from the said 2nd solid light source to the said 2nd entrance plane. According to such a feature, in the illumination device, light having a wide dispersion angle is also reflected on the reflecting surface and irradiated onto the second incident surface. Therefore, it is possible to suppress a decrease in light utilization efficiency.

  In the first feature described above, the first arrangement member includes a pedestal portion having an upper surface as the first arrangement surface.

  In the first feature described above, the optical unit includes a single optical element (for example, a tapered rod integrator) having the first incident surface and the second incident surface as the same incident surface (for example, the incident surface 21a). 21), and the first arrangement member and the second arrangement member are formed of a single body (for example, the core board member 11). According to such a feature, the illumination device irradiates the second incident surface even when the first fixed light source and the second fixed light source are a multi-chip type that is arranged on an integral arrangement member. The difference between the dispersion angle distribution of the light and the dispersion angle distribution of the light applied to the first incident surface can be suppressed.

  In the first feature described above, each of the first solid light source and the second solid light source includes a plurality of solid light sources.

  In the first feature described above, the optical unit is a single optical element having the first incident surface and the second incident surface as the same incident surface. The first arrangement member includes a pedestal portion having an upper surface as the first arrangement surface. The second placement member includes a recess having a bottom surface as the second placement surface. The first arrangement member and the second arrangement member are arranged side by side so that the inclined surface of the pedestal portion becomes the inclined surface of the recess. The inclined surface of the pedestal portion is configured by a reflecting surface that reflects light emitted from the second solid light source to the second incident surface.

  A projection display apparatus (projection display apparatus 100) according to the second feature includes the above-described illumination apparatus, a light modulation element (for example, display panel 30) that modulates light emitted from the illumination apparatus, A projection lens (for example, a projection lens unit 110) that projects light modulated by the light modulation element onto a screen.

  According to the characteristics of the present invention, it is possible to provide an illumination device and a projection display apparatus that suppress the occurrence of color unevenness in a projected image while using a plurality of solid light sources having different directivities.

  A first embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Outline of the projection display apparatus according to the first embodiment of the present invention)
An outline of the projection display apparatus according to the first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the projection display apparatus 100 according to this embodiment includes a projection lens unit 110, and projects the image light magnified by the projection lens unit 110 onto a screen 200. Further, the projection display apparatus 100 projects image light onto the screen 200 using red light (R), green light (G), and blue light (B).

(Schematic configuration of lighting device)
Next, the configuration of the illumination device 120 provided in the projection display apparatus 100 will be described with reference to FIG. FIG. 2 shows a schematic configuration of the projection display apparatus 100. As shown in FIG. 2, the projection display apparatus 100 includes a light source 10, a taper type rod integrator 21, a display panel 30, and a projection lens unit 110.

  Here, the illumination device 120 according to the present embodiment includes the light source 10 and the taper-type rod integrator 21. In FIG. 2, the display panel 30 and the projection lens unit 110 are shown, but it should be noted that these are not included in the illumination device 120.

  The light source 10 includes a plurality of solid light sources having different color lights. Specifically, the light source 10 includes a red LED (light emitting diode) that emits red light, a green LED that emits green light, and a blue LED that emits blue light. That is, in the light source 10, the wavelength of the light emitted from the green LED and the blue LED is different from the wavelength of the light emitted from the red LED 10a. Further, the light source 10 irradiates the tapered rod integrator 21 with the color light emitted from each color LED.

  The taper-type rod integrator 21 includes an incident surface 21a, a reflective surface 21c having a taper, and an output surface 21b. Further, the tapered rod integrator 21 reduces the dispersion angle of the green light and blue light emitted from the green LED and the blue LED and the red light emitted from the red LED. Specifically, the taper-type rod integrator 21 receives each color light emitted from the light source 10 from the incident surface 21a, reflects each incident color light by the reflecting surface 21c, thereby reducing the dispersion angle, and outputs the light emitting surface 21b. To the display panel 30.

  The incident surface 21a of the tapered rod integrator 21 is irradiated with an incident surface (first incident surface) irradiated with green light and blue light emitted from the green LED 10b and the blue LED 10c, and red light emitted from the red LED 10a. And an incident surface (second incident surface). That is, the tapered rod integrator 21 according to the present embodiment includes an incident surface irradiated with green light and blue light and an incident surface irradiated with red light as the same incident surface 21a. In the present embodiment, the tapered rod integrator 21 constitutes an optical unit.

  The display panel 30 is a transmissive display panel such as a liquid crystal panel. Further, the display panel 30 modulates the red light, the green light, and the blue light emitted from the tapered rod integrator 21 and outputs the modulated light to the projection lens unit 110 as image light. In the present embodiment, the display panel 30 constitutes a light modulation element that modulates each color light.

  The projection lens unit 110 projects the image light modulated by the display panel 30 onto the screen 200.

(Schematic configuration of light source)
Next, the configuration of the light source 10 according to the present embodiment will be specifically described. 3A shows a front view of the light source 10 according to the present embodiment as viewed from the tapered rod integrator 21 side, and FIG. 3B shows a side view of the light source 10. Has been. Hereinafter, the light emission direction (optical axis direction) from the light source 10 is assumed to be a horizontal direction, and the direction parallel to the incident surface 21a of the tapered rod integrator 21 is assumed to be a vertical direction. The horizontal direction and the vertical direction are orthogonal to each other.

  As shown in FIGS. 3A to 3B, the light source 10 includes a core board member 11, a red LED 10a that emits red light, a green LED 10b that emits green light, and a blue LED 10c that emits blue light. Is provided.

  Here, in the present embodiment, the red light emitted from the red LED 10a has a dispersion angle distribution as shown in FIG. 16A, and the green light and blue light emitted from the green LED 10b and the blue LED 10c are illustrated in FIG. It is assumed that the dispersion angle distribution is as shown in 16 (b). That is, in this embodiment, the red light emitted from the red LED 10a has a wider directivity than the green light and blue light emitted from the green LED 10b and the blue LED 10c.

  In the present embodiment, the green LED 10b and the blue LED 10c constitute a first solid-state light source that emits light having a first directivity. In the present embodiment, the red LED 10a constitutes a second solid-state light source that emits light having a second directivity that is wider than the green LED 10b and the blue LED 10c.

  The core board member 11 includes an arrangement surface F1 (first arrangement surface) on which the green LEDs 10b and the blue LEDs 10c are arranged, and an arrangement surface F2 (second arrangement surface) on which the red LEDs 10a are arranged. Further, in the core board member 11, the arrangement surface F <b> 1 and the arrangement surface F <b> 2 are arranged so as to face the incident surface 21 a of the tapered rod integrator 21.

  The core board member 11 includes a reference surface provided at a position away from the incident surface 21a by a predetermined distance and a recess 12 provided on the reference surface. In the present embodiment, the above-described reference plane is the same plane as the arrangement plane F1 on which the green LEDs 10b and the blue LEDs 10c are arranged.

  Specifically, as shown in FIG. 3B, the core board member 11 includes a concave portion 12 that is recessed in the direction opposite to the incident surface 21a side on the arrangement surface F1. The arrangement surface F2 on which the red LED 10a is arranged is provided on the bottom surface of the recess 12. That is, in the core board member 11, the distance from the arrangement surface F2 to the incident surface 21a is longer than the horizontal distance “d” from the arrangement surface F1 to the incident surface 21a by the recessed distance “Δd”. It is configured.

  Moreover, in this embodiment, the core board member 11 comprises the 1st arrangement | positioning member provided with the arrangement | positioning surface F1 in which the green LED10b and blue LED10c are arrange | positioned. Moreover, in this embodiment, the core board member 11 comprises the 2nd arrangement | positioning member provided with the arrangement | positioning surface F2 in which red LED10a is arrange | positioned. That is, in the present embodiment, the first placement member and the second placement member are integrally formed by the core board member 11.

(Distance of solid light source)
Next, the relationship between the distance from the arrangement surface F1 to the incident surface 21a and the distance from the arrangement surface F2 to the incident surface 21a will be described. FIG. 4 shows a cross-sectional view taken along line AA of the front view shown in FIG. 3A and a taper type rod integrator 21.

  Here, as shown in FIG. 4, the thickness of the red LED 10a is “t”, the vertical distance from the end of the reflecting surface 21c to the end of the red LED 10a is “h”, and the incidence surface 21a and the arrangement surface F1 are separated. If the horizontal distance is “d” and the maximum dispersion angle of the red light emitted from the red LED 10a to be irradiated on the incident surface 21a is “θ”, the horizontal direction between the incident surface 21a and the arrangement surface F2 The distance “d + Δd” is calculated by the following equation (1).

d + Δd = (h / tan θ) + t (1)
For example, the thickness “t” of the red LED 10a is “0.5 mm”, the distance “d” between the incident surface 21a and the arrangement surface F1 is “2 mm”, the interval “h” is “2 mm”, and the red LED 10a is emitted from the red LED 10a. In the case where it is desired to irradiate the incident surface 21a with red light having a dispersion angle “θ” within “30 °”, the distance “d + Δd” between the incident surface 21a and the arrangement surface F2 is “3. 96 mm ".

  As described above, in the illumination device 120, the arrangement surface F2 is provided at a position separated by “d + Δd” calculated by the equation (1) from the incident surface 21a, and the red LED 10a is arranged, as shown in FIG. For example, a part of red light having a dispersion angle “θX” larger than the dispersion angle “θ” is not irradiated to the incident surface 21a.

  In addition, the recessed part 12 may be formed in other shapes. For example, as shown in the front view of FIG. 5A and the cross-sectional view of FIG. 5B (cross-sectional view taken along the line BB), the recess 12 is recessed by cutting out a part of the arrangement surface F1. It may also be formed. Furthermore, the concave portion 12 is not limited to a quadrangular shape, and may be formed in a circular shape (not shown).

(Function and effect)
According to the projection display apparatus 100 according to the present embodiment, the red LED 10a is arranged more than the distance from the arrangement surface F1 where the green LED 10b and the blue LED 10c are arranged to the incident surface 21a of the tapered rod integrator 21. The distance from the arrangement surface F2 to the incident surface 21a is longer.

  Therefore, in the illumination device according to the related art, red light having a large dispersion angle is also irradiated on the incident surface 21a. However, in the illumination device 120 described above, the red light emitted from the red LED 10a has a dispersion angle. Small red light is irradiated onto the incident surface 21a, and red light with a large dispersion angle is prevented from being irradiated onto the incident surface 21a. That is, the illumination device 120 reduces the difference between the dispersion angle distribution of the red light emitted from the red LED 10a and the dispersion angle distribution of the green light and the blue light emitted from the green LED 10b and the blue LED 10c so that each color light is emitted. The light enters the incident surface 21 a of the tapered rod integrator 21. In the illumination device 120, the tapered rod integrator 21 irradiates the display panel 30 with each color light in which the difference in the distribution angle distribution is reduced.

  Therefore, according to the projection display apparatus 100 according to the present embodiment, while using a plurality of solid light sources (red LED 10a, green LED 10b, and blue LED 10c) having different directivities, occurrence of color unevenness in the projected image is suppressed. be able to.

  Further, according to the projection display apparatus 100 according to the present embodiment, the illuminating device 120 has red on the arrangement surface F1 on which the green LED 10b and the blue LED 10c are arranged, and on the bottom surface of the recess 12 provided on the arrangement surface F1. An arrangement surface F2 on which the LED 10a is arranged is provided. Therefore, even if the illumination device 120 uses a multichip type in which the green LED 10b, the blue LED 10c, and the red LED 10a are arranged on the integral core board member 11, the dispersion of the red light irradiated on the incident surface 21a. The difference between the angular distribution and the dispersion angle distribution of green light and blue light can be reduced.

[Second Embodiment]
The outline of the illumination device 120 according to the second embodiment of the present invention will be described by focusing on the differences from the first embodiment. FIG. 6A shows a front view of the light source 10 according to the present embodiment as viewed from the tapered rod integrator 21 side, and FIG. 6B shows the front view of FIG. A cross-sectional view taken along line CC of the front view shown is shown.

  As shown in FIGS. 6A to 6B, in the light source 10 according to the present embodiment, the concave portion 12 emits red light emitted from the red LED 10a on the side wall from the bottom surface to the arrangement surface F1 (reference surface). Further provided are reflecting surfaces 12a to 12d that reflect to the incident surface 21a.

(Red light reflected by the reflecting surface)
Next, the red light reflected by the reflection surfaces 12a to 12d described above will be described by focusing on the reflection surface 12a. FIG. 7 shows a cross-sectional view of the red LED 10a, the reflecting surface 12a, and the tapered rod integrator 21.

  Here, as shown in FIG. 7, the inclination angle of the reflecting surface 12a provided on the side wall is “θ1”, the angle from the light emitting surface of the red light emitted from the red LED 10a is “θ2”, and the incident surface 21a The dispersion angle of the red light to be irradiated is “θ3”. The red light in the range of the angle “θ2” from the light emitting surface is a part of the red light that is not directly irradiated onto the incident surface 21a from the light emitting surface. The angle “θA” between the red light reflected by the reflecting surface 12a and the reflecting surface 12a is expressed by the following equation (2). Here, it is assumed that “θ2” is a smaller angle than “θ1”.

θA = θ1-θ2 (2)
Further, the incident angle “θB” of the red light reflected by the reflecting surface 12a with respect to the incident surface 21a is expressed by the following equation (3).

θB = | 90 ° −θ1−θA | = | 90 ° −2 * θ1 + θ2 | (3)
If the dispersion angle of red light to be irradiated onto the incident surface 21a is red light in the range of “θ3”, the incident angle “θB” may be equal to or smaller than “θ3” as shown in the following equation (4). preferable.

| ΘB | ≦ | θ3 | (4)
For example, assuming that the inclination angle “θ1” of the reflecting surface 12a is “45 °”, from the above-described formula (3), in the lighting device 120, the angle “θ2” from the light emitting surface of the red LED 10a “0 °” to “30”. The red light in the range up to “°” can be reflected by the reflecting surface 12a, and the incident surface 21a can be irradiated as red light in the range of incident angles “θB” “0 °” to “30 °”.

  The red light in the range from the angle “θ2” “0 °” to “30 °” from the light emitting surface is from the dispersion angle “60 °” to “90 °” or “−90 °” shown in FIG. Red light in the range of “−60 °”. Therefore, when the red LED 10a is provided away from the incident surface 21a so as to irradiate the incident surface 21a with red light in the range of the dispersion angle “θ3”, the red light in the range up to the angle “θ2” from the light emitting surface is Although it is a part of the red light that is not irradiated on the incident surface 21a, the incident surface 21a can be irradiated as red light within the range of the dispersion angle “θ3” by being reflected by the reflecting surface 12a.

  The inclination angle “θ1” of the reflecting surface 12a is not limited to “45 °”, and may be designed according to the incident angle “θB” of red light to be irradiated onto the incident surface 21a.

(Function and effect)
According to the projection display apparatus 100 according to the present embodiment, the illuminating device 120 reflects red light having a large dispersion angle to the reflecting surfaces 12 a to 12 d and irradiates the incident surface 21 a of the tapered rod integrator 21. Therefore, it is possible to suppress a decrease in red light utilization efficiency. In the illumination device 120, red light with a large dispersion angle emitted from the red LED 10a is reflected on the reflection surface 12a, so that red light with a small dispersion angle (red light directly irradiated on the incident surface 21a) is incident. The incident surface 21a can be irradiated close to the corner.

[Third Embodiment]
The projection display apparatus 100 according to the third embodiment of the present invention will be described by paying attention to differences from the first embodiment. In the projection display apparatus 100 according to the first embodiment, the illumination device 120 is configured such that the red LED 10a, the green LED 10b, and the blue LED 10c are arranged on the same core board member 11. The lighting device 120 according to the embodiment is configured to arrange the red LED 10a, the green LED 10b, and the blue LED 10c on separate core board members.

  FIG. 8 shows an outline of the projection display apparatus 100 according to the present embodiment. As shown in FIG. 8, the projection display apparatus 100 according to this embodiment includes light sources 10_1 to 10_2, tapered rod integrators 22 to 23, display panels 30a to 30b, a dichroic prism 16, and a projection lens unit. 110.

  Here, the illumination device 120 according to the present embodiment includes light sources 10_1 to 10_2 and tapered rod integrators 22 to 23. 8 shows the display panels 30a to 30b, the dichroic prism 16, and the projection lens unit 110, it should be noted that these are not included in the illumination device 120.

  The light source 10_1 includes a core board member 11a (first arrangement member) provided with an arrangement surface F1 (first arrangement surface) on which the green LEDs 10b and the blue LEDs 10c are arranged. Further, in the light source 10_1, the arrangement surface F1 of the core board member 11a and the incident surface 22a (described later) of the tapered rod integrator 22 are arranged to face each other.

  The light source 10_2 includes a core board member 11b (second arrangement member) provided with an arrangement surface F2 (second arrangement surface) on which the red LED 10a is arranged. Further, in the light source 10_2, the arrangement surface F2 of the core board member 11b and the incident surface 23a (described later) of the tapered rod integrator 23 are arranged to face each other.

  The tapered rod integrator 22 includes an incident surface 22a (first incident surface) that is irradiated with green light and blue light emitted from the green LED 10b and the blue LED 10c. In addition, the taper-type rod integrator 22 reduces the incident green light and blue light at a low dispersion angle and emits them to the display panel 30a.

  The tapered rod integrator 23 includes an incident surface 23a (second incident surface) on which the red light emitted from the red LED 10a is irradiated. Further, the tapered rod integrator 23 reduces the incident red light to a low dispersion angle and emits it to the display panel 30b. The tapered rod integrator 22 and the tapered rod integrator 23 described above have the same structure in terms of the area of the incident surface, the area of the exit surface, the angle of the reflecting surface, and the like. In the present embodiment, the tapered rod integrators 22 to 23 constitute an optical unit.

  The display panels 30a to 30b are transmissive display panels such as liquid crystal panels. The display panel 30a modulates the green light and the blue light emitted from the tapered rod integrator 22 and emits them to the dichroic prism 16 as video light. Further, the display panel 30b modulates the red light emitted from the tapered rod integrator 23 and emits it to the dichroic prism 16 as video light.

  The dichroic prism 16 includes a dichroic surface that reflects red light and transmits green light and blue light. The dichroic prism 16 guides the image light modulated by the display panels 30 a to 30 b to the projection lens unit 110. The projection lens unit 110 projects the image light guided by the dichroic prism 16 onto the screen 200.

(Configuration of light source)
Next, the configuration of the light source 10_2 will be specifically described. In the light source 10_2, the distance from the arrangement surface F2 where the red LED 10a is arranged to the incident surface 23a is greater than the distance "d" from the arrangement surface F1 where the green LED 10b and the blue LED 10c are arranged to the incident surface 22a. It is longer by Δd ″.

  Specifically, as shown in FIG. 9, in the light source 10_2, the core board member 11b is provided on the reference surface F0 provided at a position that is separated from the incident surface 23a in the horizontal direction by a predetermined distance, and on the reference surface F0. Recessed portion 12 formed.

  Here, the predetermined distance from the reference surface F0 to the incident surface 23a is equal to the distance “d” from the arrangement surface F1 where the green LED 10b and the blue LED 10c are disposed to the incident surface 22a. In addition, the core board member 11 b is provided with an arrangement surface F <b> 2 on which the red LED 10 a is arranged on the bottom surface of the recess 12.

  That is, as shown in FIG. 9, in the core board member 11b, the distance from the arrangement surface F2 where the red LED 10a is arranged to the incident surface 23a is from the arrangement surface F1 where the green LED 10b and the blue LED 10c are arranged to the incident surface 21a. It is configured to be longer than the horizontal distance “d” by the recessed distance “Δd”. The distance “Δd” is calculated based on the above-described equation (1).

(Function and effect)
According to the projection display apparatus 100 according to the present embodiment, in the illumination device 120, the distance from the arrangement surface F2 on which the red LED 10a is arranged to the incident surface 23a is incident from the arrangement surface F1 on which the green LED 10b and the blue LED 10c are arranged. The distance Δd is longer than the distance “d” to the surface 22a.

  Thereby, the illuminating device 120 suppresses that the light with a large dispersion angle is inject | emitted on the entrance plane 21a among the red light radiate | emitted from red LED10a. That is, the illumination device 120 reduces the difference between the dispersion angle distribution of the red light emitted from the red LED 10a and the dispersion angle distribution of the green light and the blue light emitted from the green LED 10b and the blue LED 10c so that each color light is emitted. The light enters the incident surfaces 22a to 23a of the tapered rod integrators 22 to 23. In the illuminating device 120, the tapered rod integrators 22 to 23 irradiate the display panels 30a to 30b with the respective color lights with reduced dispersion angle distribution differences.

  Therefore, according to the projection display apparatus 100 according to the present embodiment, while using a plurality of solid light sources (red LED 10a, green LED 10b, and blue LED 10c) having different directivities, occurrence of color unevenness in the projected image is suppressed. be able to.

(Example of change)
A modified example of the above-described third embodiment will be described. In the third embodiment described above, as shown in the second embodiment, the concave surface 12 reflects the red light emitted from the red LED 10a to the incident surface 22a on the side wall from the bottom surface to the reference surface F0. 12d may be provided.

  According to the projection display apparatus 100 according to the present embodiment, the illuminating device 120 reflects red light having a large dispersion angle to the reflecting surfaces 12 a to 12 d and irradiates the incident surface 21 a of the tapered rod integrator 21. Therefore, it is possible to suppress a decrease in red light utilization efficiency.

[Fourth Embodiment]
A projection display apparatus 100 according to a fourth embodiment of the present invention will be described by paying attention to differences from the first to third embodiments. In the projection display apparatus 100 according to the first embodiment, the illumination device 120 is configured such that the red LED 10a, the green LED 10b, and the blue LED 10c are arranged on the same core board member 11, but this embodiment The lighting device 120 according to the embodiment is configured to arrange the red LED 10a, the green LED 10b, and the blue LED 10c on separate arrangement members.

  FIG. 10 shows a schematic configuration of the projection display apparatus 100 according to the present embodiment. The projection display apparatus 100 according to the present embodiment includes light sources 10_2 to 10_4, tapered rod integrators 23 to 25, reflection mirrors 17a to 17b, a cross dichroic prism 18, a display panel 30, and a projection lens unit 110. With.

  Here, the illuminating device 120 according to the present embodiment includes the light sources 10_2 to 10_4 and the tapered rod integrators 23 to 24. 10 shows the reflection mirrors 17a to 17b, the cross dichroic prism 18, the display panel 30, and the projection lens unit 110, these are not included in the illumination device 120. Should.

  Since the light source 10_2 has the same configuration as the light source 10_2 according to the second embodiment, the description thereof is omitted here.

  The light source 10_3 includes a core board member 11c (first arrangement member) provided with an arrangement surface F3 (first arrangement surface) on which the green LED 10b is arranged. In the light source 10_3, the arrangement surface F3 of the core board member 11c and the incident surface 24a (described later) of the tapered rod integrator 24 are arranged to face each other.

  The light source 10_4 includes a core board member 11d (first arrangement member) provided with an arrangement surface F4 (first arrangement surface) on which the blue LED 10c is arranged. In the light source 10_4, the arrangement surface F4 of the core board member 11d and the incident surface 25a (described later) of the tapered rod integrator 25 are arranged to face each other.

  The distance from the arrangement surface F3 where the green LED 10b is arranged to the incident surface 24a and the distance from the arrangement surface F4 where the blue LED 10c is arranged to the incident surface 25a are equal to the distance “d”. Further, the distance from the arrangement surface F2 on which the red LED is arranged to the incident surface 23a is a distance Δd from the distance “d” from the arrangement surface F3 (or the arrangement surface F4) to the incident surface 24a (or the incident surface 25a). Just long.

  The tapered rod integrator 23 includes an incident surface 23a (second incident surface) on which the red light emitted from the red LED 10a is irradiated. The tapered rod integrator 23 reduces the incident red light to a low dispersion angle and emits it to the reflection mirror 17b.

  The tapered rod integrator 24 includes an incident surface 24a (first incident surface) on which green light emitted from the green LED 10b is irradiated. The tapered rod integrator 24 reduces the incident green light to a low dispersion angle and emits it to the cross dichroic prism 18.

  The tapered rod integrator 25 includes an incident surface 25a (first incident surface) on which the blue light emitted from the blue LED 10c is irradiated. Further, the taper type rod integrator 25 reduces the incident blue light to a low dispersion angle and emits it to the reflection mirror 17a.

  The tapered rod integrators 23 to 25 described above have the same structure in terms of the area of the entrance surface, the area of the exit surface, the angle of the reflection surface, and the like. In the present embodiment, the tapered rod integrators 23 to 25 constitute an optical unit.

  The reflection mirror 17a reflects the blue light emitted from the tapered rod integrator 25 to the cross dichroic prism 18 side. The reflection mirror 17b reflects the red light emitted from the tapered rod integrator 23 to the cross dichroic prism 18 side.

  The cross dichroic prism 18 includes a dichroic surface that reflects red light and blue light and transmits green light. The cross dichroic prism 18 guides red light, green light, and blue light emitted from the tapered rod integrators 23 to 25 to the display panel 30.

  Since the display panel 30 and the projection lens unit 110 have the same configuration as the display panel 30 and the projection lens unit 110 according to the first embodiment, description thereof is omitted here.

(Function and effect)
According to the projection display apparatus 100 according to the present embodiment, in the illumination device 120, the distance from the arrangement surface F2 on which the red LED 10a is arranged to the incident surface 23a is arranged on the arrangement surface F3 on which the green LED 10b (or the blue LED 10c) is arranged. The distance “Δd” is longer than the distance “d” from the (or the arrangement surface F4) to the incident surface 24a (or the incident surface 25a).

  Thereby, the illuminating device 120 suppresses that the light with a large dispersion angle is inject | emitted on the entrance plane 21a among the red light radiate | emitted from red LED10a. That is, the illumination device 120 reduces the difference between the dispersion angle distribution of the red light emitted from the red LED 10a and the dispersion angle distribution of the green light and the blue light emitted from the green LED 10b and the blue LED 10c so that each color light is emitted. Incident light enters the incident surfaces 23a to 25a of the tapered rod integrators 23 to 25. In the illuminating device 120, the tapered rod integrators 23 to 25 irradiate the display panel 30 with each color light with a reduced dispersion angle distribution through the reflection mirrors 17a to 17b and the cross dichroic prism 18. .

  Therefore, according to the projection display apparatus 100 according to the present embodiment, while using a plurality of solid light sources (red LED 10a, green LED 10b, and blue LED 10c) having different directivities, occurrence of color unevenness in the projected image is suppressed. be able to.

[Fifth Embodiment]
Hereinafter, the light source 10 according to the fifth embodiment will be described by focusing on differences from the first embodiment. FIG. 11A shows a front view of the light source 10 according to the fifth embodiment when viewed from the tapered rod integrator 21 side, and FIG. 11B shows the light source 10 shown in FIG. Sectional drawing of the DD line of the front view shown to is shown.

  As shown in FIGS. 11A to 11B, the core board member 11 includes a pedestal portion 13 having an arrangement surface F1 as an upper surface. The pedestal portion 13 is provided on the arrangement surface F <b> 2 of the core board member 11. The height of the pedestal portion 13 corresponds to the above-described Δd.

  Similar to the first embodiment, the green LED 11b is arranged on the arrangement surface F1. On the arrangement surface F2, the red LED 11a is arranged. Accordingly, the distance from the arrangement surface F2 to the tapered rod integrator (incident surface) is longer than the distance from the arrangement surface F1 to the taper type rod integrator (incident surface).

  It should be noted that the mechanism for suppressing the light having a large dispersion angle (red light) from entering the tapered rod integrator is the same as in the first embodiment.

(Function and effect)
According to the fifth embodiment, the distance from the arrangement surface F2 to the tapered rod integrator (incident surface) is longer than the distance from the arrangement surface F1 to the tapered rod integrator (incident surface). Therefore, the same effect as the first embodiment can be obtained.

[Sixth Embodiment]
Hereinafter, the light source 10 according to the sixth embodiment will be described by focusing on differences from the fifth embodiment. FIG. 12A shows a front view of the light source 10 according to the sixth embodiment when viewed from the tapered rod integrator 21 side, and FIG. 12B shows the light source 10 shown in FIG. Sectional drawing of the EE line of the front view shown to is shown.

  As illustrated in FIG. 12A, the light source 10 includes a plurality of red LEDs 10a, a plurality of green LEDs 10b, a plurality of blue LEDs 10c, and a core board member 11.

  Here, it should be noted that the directivity of light emitted from each LED has the following relationship. Specifically, the directivity of each color light has a relationship of directivity of red light> directivity of blue light> directivity of green light.

  As shown in FIGS. 12A to 12B, the core board member 11 includes a pedestal portion 13a having an arrangement surface F1 as an upper surface and a pedestal portion 13b having an arrangement surface F3 as an upper surface. The pedestal portion 13 a and the pedestal portion 13 b are provided on the arrangement surface F <b> 2 of the core board member 11. The height of the pedestal portion 13a is Δd1 (Δd described above), and the height of the pedestal portion 13b is Δd2 (<Δd1).

  That is, the distance from the arrangement surface F1 to the taper-type rod integrator (incident surface) is longer than the distance from the arrangement surface F3 to the taper-type rod integrator (incident surface). The distance from the arrangement surface F3 to the taper type rod integrator (incident surface) is longer than the distance from the arrangement surface F2 to the taper type rod integrator (incident surface).

  It should be noted that the mechanism for suppressing the light having a large dispersion angle (red light) from entering the tapered rod integrator is the same as in the first embodiment.

(Function and effect)
According to the sixth embodiment, since the height of the pedestal portion differs according to the directivity of each LED, it is possible to suppress light having a large dispersion angle from entering the tapered rod integrator for each color light. it can.

[Seventh Embodiment]
Hereinafter, the light source 10 according to the seventh embodiment will be described by paying attention to differences from the first embodiment and the fifth embodiment. FIG. 13A shows a front view of the light source 10 according to the seventh embodiment when viewed from the tapered rod integrator 21 side, and FIG. 13B shows the light source 10 shown in FIG. Sectional drawing of the FF line | wire of the front view shown to is shown.

  As shown in FIGS. 13A to 13B, the core board member 11 includes a recess 12 having the placement surface F2 as a bottom surface and a pedestal portion 13 having the placement surface F1 as a top surface. In the core board member 11, the concave portion 12 and the pedestal portion 13 are arranged adjacent to each other so that the slope 14 of the pedestal portion 13 becomes the slope of the concave portion 12. That is, the slope of the pedestal 13 and the slope of the recess are continuous. The height difference between the bottom surface (arrangement surface F2) of the recess 12 and the upper surface (arrangement surface F1) of the pedestal portion 13 corresponds to the above-described Δd.

  Similar to the first embodiment, the green LED 11b is arranged on the arrangement surface F1. On the arrangement surface F2, the red LED 11a is arranged. Accordingly, the distance from the arrangement surface F2 to the tapered rod integrator (incident surface) is longer than the distance from the arrangement surface F1 to the taper type rod integrator (incident surface).

  It should be noted that the mechanism for suppressing the light having a large dispersion angle (red light) from entering the tapered rod integrator is the same as in the first embodiment.

(Function and effect)
According to the seventh embodiment, the distance from the arrangement surface F2 to the tapered rod integrator (incident surface) is longer than the distance from the arrangement surface F1 to the tapered rod integrator (incident surface). Therefore, the same effect as the first embodiment can be obtained.

(Example of change)
A modified example of the above-described seventh embodiment will be described. In the seventh embodiment described above, as shown in the second embodiment, the slope of the recess 12 (that is, the slope 14 of the pedestal portion 13) may be configured by a reflective surface.

[Eighth Embodiment]
Hereinafter, a projection display apparatus according to the eighth embodiment will be described. FIG. 14 is a diagram showing a projection display apparatus according to the eighth embodiment. In FIG. 14, it should be noted that the same components as those in FIG.

  As shown in FIG. 14, the projection display apparatus 100 includes a light source 10, a tapered rod integrator 21, a lens 130, a reflection mirror 140, a DMD 150, a lens 160, and a projection lens 110.

  The lens 130 is a lens that condenses the light emitted from the tapered rod integrator 21 on the DMD 150.

  The reflection mirror 140 reflects the light emitted from the tapered rod integrator 21 to the DMD 150 side. It should be noted that the reflection mirror 140 is provided on the optical path of the light emitted from the tapered rod integrator 21, but is not provided on the optical path of the light (effective light) reflected by the DMD 150. It is.

  The DMD 150 is composed of a plurality of micro lenses (Digital Micromirror Device). The angle of each micro lens is adjusted according to the video input signal. The light (effective light) reflected by the DMD 150 is guided to the projection lens 110 without passing through the reflection mirror 140.

  The lens 160 a and the lens 160 b collect the light reflected by the DMD 150 on the projection lens 110.

  Here, it should be noted that the configuration and arrangement of the light source 10 are the same as those in any of the first to sixth embodiments described above. Further, except for the configuration and arrangement of the light source 10, the configuration of the projection display apparatus 100 is the same as a general configuration.

[Other Embodiments]
As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

  For example, in the above-described third to fourth embodiments, in the illumination device 120, the light source 10_2 is configured to include the concave portion 12, but the concave portion 12 is not included, and the light source 10_2 is simply replaced with the tapered rod integrator 23. The light incident surface 23a may be disposed at a position away from the other light sources by a distance “Δd”.

  In the first to fourth embodiments described above, the case where the light source 10 includes the red LED 10a that emits red light, and the green LED 10b and blue LED 10c that emit green light and blue light has been described as an example. However, the type of color light is not limited to this.

  In the first to fourth embodiments described above, the lighting device 120 has been described using an LED (light emitting diode) as an example of the solid light source, but is not limited to the LED and can be applied to various solid light sources. It is. That is, the present invention can be applied to an illumination device including various solid-state light sources having different directivities.

  The tapered rod integrator may be a solid rod made of a transparent member such as glass, or may be a hollow rod surrounded by a mirror surface.

  In addition, the configurations of the embodiments and the modified examples can be combined. The actions and effects of each embodiment and each modified example are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are limited to those described in each embodiment. Is not to be done. As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1 is a diagram illustrating an overall schematic configuration of a projection display apparatus 100 according to a first embodiment. It is a figure which shows schematic structure of the projection type video display apparatus 100 which concerns on 1st Embodiment, and the illuminating device 120. FIG. (A) It is a front view which shows schematic structure of the light source 10 which concerns on 1st Embodiment. (B) It is a side view which shows schematic structure of the light source 10 which concerns on 1st Embodiment. It is a figure which shows the relationship of the distance of the light source 10 and taper type rod integrator 21 which concern on 1st Embodiment. (A) It is a front view which shows the other structural example of the light source 10 which concerns on 1st Embodiment. (B) It is a side view which shows the other structure of the light source 10 which concerns on 1st Embodiment. (A) It is a front view which shows the structure of the light source 10 which concerns on 2nd Embodiment. (B) It is a side view which shows the structure of the light source 10 which concerns on 2nd Embodiment. It is a figure which shows the angle of the reflective surface with which the light source 10 which concerns on 2nd Embodiment is equipped. It is a figure which shows schematic structure of the projection type video display apparatus 100 and the illuminating device 120 which concern on 3rd Embodiment. It is a figure which shows the relationship of the distance of the other structural example of the light source which concerns on 3rd Embodiment, and the taper-type rod integrator. It is a figure which shows schematic structure of the projection type video display apparatus 100 and illuminating device 120 which concern on 4th Embodiment. (A) It is a front view which shows the structure of the light source 10 which concerns on 5th Embodiment. (B) It is a side view which shows the structure of the light source 10 which concerns on 5th Embodiment. (A) It is a front view which shows the structure of the light source 10 which concerns on 6th Embodiment. (B) It is a side view which shows the structure of the light source 10 which concerns on 6th Embodiment. (A) It is a front view which shows the structure of the light source 10 which concerns on 7th Embodiment. (B) It is a side view which shows the structure of the light source 10 which concerns on 7th Embodiment. It is a figure which shows the projection type video display apparatus 100 concerning 8th Embodiment. It is a figure which shows schematic structure of the projection type video display apparatus 100 which concerns on a prior art. (A) It is the graph which showed distribution angle distribution of red LED. (B) It is the graph which showed the dispersion angle distribution of green LED and blue LED.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light source, 10_1 thru | or 10_4 ... Light source, 10a ... Red LED, 10b ... Green LED, 10c ... Blue LED, 11 ... Core board member, 11a thru | or d ... Core board member, 12 ... Recessed part, 12a thru | or 12d ... Reflecting surface, 16 ... Dichroic prism, 17a to 17b ... Reflection mirror, 18 ... Cross dichroic prism, 21 to 25 ... Tapered rod integrator, 21a ... Incident surface, 21b ... Emission surface, 21c ... Reflection surface, 21a to 25a ... Incident surface, 30 DESCRIPTION OF SYMBOLS ... Display panel, 30a thru | or 30b ... Display panel, 100 ... Projection type image display apparatus, 110 ... Projection lens unit, 120 ... Illumination device, 130 ... Lens, 140 ... Reflection mirror, 150 ... DMD, 160 ... Lens, 200 ... Screen

Claims (8)

A first solid-state light source that emits light having a first directivity, and light having a second directional light that is wider than the first directivity and having a wavelength different from the wavelength of light emitted by the first solid-state light source. A second solid-state light source that emits light, a first arrangement member provided with a first arrangement surface on which the first solid-state light source is arranged, and a second arrangement surface on which the second solid-state light source is arranged And a second incident surface irradiated with light emitted from the second solid light source, and a second incident surface irradiated with light emitted from the second solid light source . And an optical unit that reduces a dispersion angle of light emitted from one solid light source and light emitted from the second solid light source,
The first arrangement surface is opposed to the first incident surface,
The second arrangement plane, the second length than a distance from said first arrangement surface distance to the second incident surface from the second placement surface with opposite to the incident surface to the first incident surface Kunar Arranged as
At least one side of the second incident surface is disposed at a position where light having a dispersion angle equal to or smaller than a predetermined angle out of the light emitted from the second solid light source is incident on the second incident surface. A lighting device characterized by that.   The lighting device according to claim 1, wherein the second arrangement member includes a concave portion having a bottom surface as the second arrangement surface.   The lighting device according to claim 2, wherein the inclined surface of the concave portion is configured by a reflective surface that reflects light emitted from the second solid-state light source to the second incident surface.   The lighting device according to claim 1, wherein the first arrangement member includes a pedestal portion having an upper surface as the first arrangement surface. The optical unit is a single optical element having the first incident surface and the second incident surface as the same incident surface,
The lighting device according to any one of claims 1 to 4, wherein the first arrangement member and the second arrangement member are formed as a single body.   The lighting device according to any one of claims 1 to 5, wherein each of the first solid light source and the second solid light source includes a plurality of solid light sources. The optical unit is a single optical element having the first incident surface and the second incident surface as the same incident surface,
The first arrangement member includes a pedestal portion having an upper surface as the first arrangement surface,
The second arrangement member includes a recess having a bottom surface as the second arrangement surface,
The first arrangement member and the second arrangement member are arranged side by side so that the inclined surface of the pedestal portion becomes the inclined surface of the concave portion,
2. The illumination device according to claim 1, wherein the inclined surface of the pedestal portion is configured by a reflective surface that reflects light emitted from the second solid light source to the second incident surface.   8. The illumination device according to claim 1, a light modulation element that modulates light emitted from the illumination device, and a projection lens that projects light modulated by the light modulation element onto a screen; A projection-type image display device comprising:

Images