JP2004226613A - Illuminator and projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical illuminator using a light emitting diode or the like as an auxiliary light source, and a projection type video display device using the illuminator. <P>SOLUTION: An auxiliary light source 12 is constituted by arranging LED chips 12a... emitting red light in an array state and also arranging lens cells 12b... for collimating light on the light emitting side of the respective LED chips 12a. The LED chips 12a are arranged corresponding to the respective lenses of a pair of fly-eye lenses 2, so that the individual pair of lenses guides the light emitted from the LED chips 12a to all the surfaces of liquid crystal light valves 31, 32 and 33. A compositing mirror 13 transmits white light emitted from a main light source 11, reflects the light emitted from the light source 12 and composites the white light and the auxiliary light emitted from both light sources 11 and 12 and guides it to a pair of fly-eye lenses 2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a lighting device and a projection type video display device.
[0002]
[Prior art]
Illumination devices used in liquid crystal projectors and the like generally include a white lamp such as an ultra-high pressure mercury lamp, a metal halide lamp, and a xenon lamp, and a parabolic reflector that converts the irradiation light into parallel light. Further, in recent years, it has been considered that a light-emitting diode (LED) is used as an auxiliary light source to compensate for a wavelength component which is insufficient from the viewpoint of color reproducibility of a white lamp (white light source) (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-174854
[Problems to be solved by the invention]
However, further improvement is required in improving the color reproducibility of a white light source using a light emitting diode or the like as an auxiliary light source.
[0005]
In view of the above circumstances, an object of the present invention is to provide a practical lighting device using a light emitting diode or the like as an auxiliary light source, and a projection display device using the same.
[0006]
[Means for Solving the Problems]
An illuminating device according to the present invention is an illuminating device comprising a white light source and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility in the white light source in order to solve the above problem. An optical axis of the white light source and an optical axis of the auxiliary light source are arranged so as to intersect with each other, a light synthesizing unit is provided at the intersection, and light from the white light source and light from the auxiliary light source are synthesized. It is characterized by emitting light.
[0007]
According to the above configuration, the light from the white light source and the light from the auxiliary light source are combined by the light combining unit, and the wavelength component that is insufficient from the viewpoint of color reproducibility in the white light source is supplemented.
[0008]
The auxiliary light source may be configured by arranging a plurality of solid-state light sources that emit parallel light, and may include an integrating unit on a light emitting side of the light combining unit. According to this, it is possible to avoid the inconvenience that the light of each solid light source is scatteredly guided on the irradiation target.
[0009]
Further, the lighting device of the present invention is a lighting device comprising a white light source and an auxiliary light source that emits a wavelength component which is considered to be insufficient from the viewpoint of color reproducibility in the white light source, wherein a predetermined wavelength is used as the auxiliary light source. A light source that emits only red light in the range is used, the auxiliary light source is arranged around the light emission region of the white light source, and an integrating means is provided at a position where light from these light sources is received. Further, the lighting device of the present invention is a lighting device comprising a white light source and an auxiliary light source which emits a wavelength component which is considered to be insufficient from the viewpoint of color reproducibility in the white light source, wherein the white light source is round. Wherein the light emitting portion is restricted by a shielding material to have a square light emitting portion, the auxiliary light source is arranged on the shielding material, and an integrating means is provided at a position for receiving light from these light sources. And In these configurations, the auxiliary light source is configured by arranging a plurality of solid-state light sources that emit parallel light, includes a fly-eye lens pair as the integration means, and includes each solid-state light source and each lens unit of the fly-eye lens pair. It is good to correspond.
[0010]
Further, the lighting device of the present invention is a lighting device including a white light source having a concave reflecting member, and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility in the white light source, The light emitted from the auxiliary light source is condensed near the light emitting point of the white light source. Further, the illumination device of the present invention is an illumination device including a white light source and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility in the white light source, wherein the light emitted from the white light source is And the light emitted from the auxiliary light source is also focused at the predetermined position, and the light incident surface of the rod prism is located at the predetermined position. In these configurations, the auxiliary light source may be configured by arranging a plurality of solid-state light sources, and each solid-state light source may include a light-collecting element.
[0011]
Further, when the auxiliary light source includes a plurality of solid light sources, the auxiliary light source may include solid light sources having different emission light wavelengths, and may include a unit for selectively emitting light from each solid light source. According to this, it is easy to expand the color reproduction adjustment range.
[0012]
According to another aspect of the invention, there is provided a projection display apparatus including any one of the illumination devices described above.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a lighting device and a projection type video display device according to an embodiment of the present invention will be described with reference to FIGS.
[0014]
FIG. 1 is a diagram showing an optical system of a three-panel projection image display device. In such a projection display, the light emitted from the illumination device 1 is guided to the fly-eye lens pair 2. The individual lens pairs of the fly-eye lens pair 2 guide the light emitted from the illumination device 1 to the entire surface of the liquid crystal light valves 31, 32, 33. The light that has passed through the fly-eye lens pair 2 is guided to the polarization converter 3.
[0015]
The polarization conversion device 3 is configured 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 polarized light separating film of the PBS array passes, for example, P-polarized light of the light from the fly-eye lens pair 2 and changes the S-polarized light by 90 °. The S-polarized light whose optical path has been changed is reflected by the adjacent polarization splitting film and emitted as it is. On the other hand, the P-polarized light transmitted through the polarization separation film is converted into S-polarized light by the retardation plate provided on the front side (light emission side) and emitted. That is, almost all light is converted into S-polarized light. The light having passed through the polarization conversion device 3 is guided to the first dichroic mirror 6 via the condenser lens 4 and the mirror 5.
[0016]
The first dichroic mirror 6 transmits light in the red wavelength band and reflects light in the cyan (green + blue) wavelength band. The light in the red wavelength band transmitted through the first dichroic mirror 6 is reflected by the mirror 7 to change the optical path. The red light reflected by the mirror 7 is modulated by passing through a transmission type liquid crystal light valve 31 for red light. On the other hand, the light in the cyan wavelength band reflected by the first dichroic mirror 6 is guided to the second dichroic mirror 8.
[0017]
The second dichroic mirror 8 transmits light in the blue wavelength band and reflects light in the green wavelength band. The light in the green wavelength band reflected by the second dichroic mirror 8 is guided to a transmissive liquid crystal light valve 32 for green light, and is light-modulated by transmitting the light. The light in the blue wavelength band transmitted through the second dichroic mirror 8 is guided to a transmission type liquid crystal light valve 33 for blue light via mirrors 9 and 10 (relay lenses and the like are not shown) and transmitted therethrough. Light modulation.
[0018]
The liquid crystal light valves 31, 32, and 33 each include an incident-side polarizing plate, a panel portion in which liquid crystal is sealed between a pair of glass substrates (on which a pixel electrode and an alignment film are formed), and an output-side polarizing plate. Be prepared. The modulated light (image light of each color) modulated by passing through the liquid crystal light valves 31, 32, 33 is combined by the dichroic prism 21 to become color image light. This color image light is enlarged and projected by the projection lens 22, and is projected and displayed on a screen (not shown).
[0019]
The illumination device 1 includes a main light source 11, an auxiliary light source 12, and a combining mirror 13, as shown in FIG. The main light source 11 and the auxiliary light source 12 are arranged so that their optical axes intersect. A combining mirror 13 is provided at the intersection position, and the light from the main light source 11 and the light from the auxiliary light source 12 are combined. It has become so.
[0020]
The main light source 11 includes a parabolic concave mirror (parabolic reflector) 11a and a light emitting unit 11b, and emits white light in a substantially parallel state. The light emitting section 11b is composed of an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like.
[0021]
The auxiliary light source 12 is configured by arranging LED chips 12a in an array and arranging lens cells 12b for collimating light on the light emission side of each LED chip 12a. The overall size is substantially the same as the size of the fly-eye lens pair 2. The LED chips 12a are molded with a transparent resin, and the transparent resin is formed in a convex shape to form the lens cells 12b. An LED chip 12a is arranged corresponding to each lens pair of the fly-eye lens pair 2, and each lens pair guides light emitted from the LED chip 12a to the entire surface of the liquid crystal light valve 31 (32, 33). Will be. The LED chip 12a and the lens cell 12b are formed in a square shape, and further correspond to the aspect ratio of the liquid crystal light valve 31 (32, 33). Thereby, the light emitted from the LED chip 12a can be guided to the entire surface of the liquid crystal light valve 31 (32, 33) without waste, and the utilization efficiency of the emitted light is improved.
[0022]
As the LED chip 12a, an LED chip that emits a red wavelength component, which is considered to be insufficient in terms of color reproducibility in the main light source 11, is selected. Of course, not only LED chips that emit light of the same wavelength are provided, but also, as shown in FIG. 3, an LED (1a) (12a) and an LED (2) whose emission light wavelengths are different from each other in the red light range. (12a) may be arranged. Further, a switch may be provided so as to be able to selectively supply electricity to the group of the LED (1) (12a) and the group of the LED (2) (12a) so as to selectively emit light. Good. According to this, the color reproduction adjustment range can be expanded by increasing or decreasing the light amount of the predetermined wavelength component. Note that the auxiliary light source 12 may be formed by arranging individually fabricated molded LEDs in an array.
[0023]
The combining mirror 13 has a characteristic of transmitting the white light emitted from the main light source 11 and has a high reflecting effect on the wavelength component of the light emitted from the auxiliary light source 12. White light emitted from the light source 11 and light emitted from the auxiliary light source 12 can be combined and guided to the fly-eye lens pair 2.
[0024]
FIGS. 4A and 4B show another example of the lighting device 1. In the lighting device 1, the emission optical axis of the main light source 11 and the emission optical axis of the auxiliary light source 12 are made parallel, and the auxiliary light source 12 is positioned around the parabolic concave mirror 11 a of the main light source 11. In addition, in the configuration of FIG. 4, individually molded LEDs 12c, which emit parallel light, are arranged around the parabolic concave mirror 11a as an auxiliary light source 12, and a fly-eye lens pair is provided in correspondence with this arrangement. 2 lens groups. In the configuration of FIG. 4, only the LED 12c that emits only red light within a predetermined wavelength range is arranged. Further, the LED 12c is formed in a square shape and further corresponds to the aspect ratio of the liquid crystal light valve 31 (32, 33). Thereby, the light emitted from the LED 12c can be guided to the entire surface of the liquid crystal light valve 31 (32, 33) without waste, and the utilization efficiency of the emitted light is improved. It is also possible to provide an LED that emits red light of a different wavelength among the red light in the above-described predetermined wavelength range, and adopt a configuration in which these are selectively emitted. Further, a light source having a square light exit may be employed as the main light source 11.
[0025]
FIGS. 5A and 5B show another example of the lighting device 1. In the lighting device 1, the emission optical axis of the main light source 11 and the emission optical axis of the auxiliary light source 12 are parallel to each other, and the auxiliary light source 12 is provided so as to be located around the light emission area of the main light source 11. As the main light source 11, a parabolic concave mirror 11a having a circular exit opening is used, and a shielding portion 11c is provided in the circular opening of the parabolic concave mirror 11a so as to obtain a square opening 11d. The back surface of the shielding portion 11c is a mirror surface, which makes effective use of unnecessary light. Further, the auxiliary light source 12 is located on the shielding portion 11c, thereby effectively utilizing the space. In the configuration shown in FIG. 5, the individually fabricated molded LEDs 12c which emit parallel light are arranged around the rectangular opening 11d as the auxiliary light source 12, and the fly-eye lens pair 2 is It constitutes a lens group. Further, the LED 12c is formed in a square shape and further corresponds to the aspect ratio of the liquid crystal light valve 31 (32, 33). Thereby, the light emitted from the LED 12c can be guided to the entire surface of the liquid crystal light valve 31 (32, 33) without waste, and the utilization efficiency of the emitted light is improved. In addition, a configuration may be adopted in which an LED that emits red light having a different wavelength within the above-described predetermined wavelength range is provided, and these are selectively emitted.
[0026]
FIGS. 6A and 6B show another example of the lighting device 1. The auxiliary light source 12 in the illumination device 1 is configured by arranging LEDs 12d in an annular shape corresponding to the circular opening of the parabolic concave mirror 11a. The LED 12 d includes a lens unit that condenses the emitted light, and is provided so that the converging point is near the light emitting point of the main light source 11.
[0027]
FIGS. 7A and 7B show another example of the lighting device 1. The main light source 11 of the illumination device 1 includes an elliptical concave mirror 11e so as to converge emitted light to one point. The auxiliary light source 12 is formed by arranging LEDs 12e in an annular shape corresponding to the circular opening of the elliptical concave mirror 11e. Further, a lens 12f (corresponding to the peripheral portion of the condenser lens) is provided on the light emission side of the LED 12e, and collects light emitted from the LEDs 12e. The light condensing position coincides with the light converging position of the main light source 11. Then, the light incident surface of the rod prism 14 is located at such a condensing position.
[0028]
The light incidence surface 12a and the light emission surface 14b of the rod prism 14 are set to have the same aspect ratio as the liquid crystal light valve 31 (32, 33). Light incident on the light incident surface 14a of the rod integrator 14 is integrated by repeating reflection in the rod integrator 14, and is irradiated to the liquid crystal light valves 31 (32, 33) via the condenser lens 4 and the like. In this configuration, the polarization conversion device 3 is not provided. Further, as the rod integrator 14, a rod integrator having a shape that is larger on the emission side than on the incident side can be used, and according to this, the degree of light divergence can be reduced.
[0029]
In the above description, a projection-type image display device including a transmission-type liquid crystal light valve has been described. However, the present invention is not limited to this, and a reflection-type liquid crystal light valve may be used. Instead, a light valve of a type that individually drives micromirrors serving as pixels may be used. Further, although the configuration in which three light valves are provided has been described, the configuration may be such that light from the lighting device 1 is split into or separated into one light valve without splitting. Further, the solid state light source is not limited to a light emitting diode (LED). Further, the light source is not limited to a point light source, and a surface light source (such as an organic EL) may be used as an auxiliary light source.
[0030]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a practical lighting device using a light emitting diode or the like as an auxiliary light source and a projection type video display device using the same.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an optical system of a projection display apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a lighting device of the embodiment used in the projection display apparatus of FIG. 1;
FIG. 3 is an explanatory diagram of an auxiliary light source used in the lighting device of FIG. 2;
4A and 4B are explanatory views showing a lighting device according to another embodiment of the present invention, wherein FIG. 4A is a front view and FIG. 4B is an operation explanatory view.
5A and 5B are explanatory views showing a lighting device according to another embodiment of the present invention, wherein FIG. 5A is a front view and FIG. 5B is an operation explanatory view.
6A and 6B are explanatory views showing a lighting device according to another embodiment of the present invention, wherein FIG. 6A is an explanatory view of the operation, and FIG. 6B shows the arrangement relationship between a main light source and an auxiliary light source. FIG.
FIGS. 7A and 7B are explanatory diagrams showing a lighting device according to another embodiment of the present invention, wherein FIG. 7A is an explanatory diagram of an operation, and FIG. 7B is a diagram showing an arrangement relationship between a main light source and an auxiliary light source. FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 lighting device 2 fly-eye lens pair 11 main light source 12 auxiliary light source 12a LED chips 12c, 12d, 12e LED
13 Synthetic mirror 14 Rod integrator 31, 32, 33 Liquid crystal light valve

Claims (10)

An illumination device including a white light source and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility in the white light source, wherein an optical axis of the white light source and an optical axis of the auxiliary light source are different from each other. A lighting device, wherein the lighting device is arranged so as to intersect, a light synthesizing unit is provided at the intersection position, and the light from the white light source and the light from the auxiliary light source are synthesized and emitted. 2. The lighting device according to claim 1, wherein the auxiliary light source includes a plurality of solid-state light sources that emit parallel light, and an integration unit is provided on a light emission side of the light combining unit. An illuminating device comprising a white light source and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility of the white light source, wherein the auxiliary light source emits only red light in a predetermined wavelength range as the auxiliary light source. A lighting device, wherein the auxiliary light source is disposed around a light emitting area of the white light source, and an integrating means is provided at a position for receiving light from the light source. A lighting device comprising a white light source and an auxiliary light source that emits a wavelength component considered to be inadequate from the viewpoint of color reproducibility in the white light source, wherein the white light source has a round light emitting portion formed of a shielding material. A lighting device, comprising: a rectangular light emitting portion with a limitation; the auxiliary light source disposed on the shielding member; and an integrating means at a position for receiving light from the light source. 5. The lighting device according to claim 2, wherein the auxiliary light source includes a plurality of solid light sources that emit parallel light, and includes a fly-eye lens pair as the integration unit. An illumination device, wherein each lens unit of the pair of eye lenses corresponds to each other. An illumination device comprising: a white light source having a concave reflecting member; and an auxiliary light source that emits a wavelength component that is considered insufficient from the viewpoint of color reproducibility in the white light source, wherein the auxiliary light source emits the white light. An illuminating device configured to condense light near a light emitting point of a light source. An illumination device comprising: a white light source; and an auxiliary light source that emits a wavelength component that is considered to be insufficient from the viewpoint of color reproducibility of the white light source. An illuminating device wherein the light emitted from the light source is also condensed at the predetermined position, and the light incident surface of the rod prism is located at the predetermined position. 8. The lighting device according to claim 6, wherein the auxiliary light source includes a plurality of solid-state light sources, and each solid-state light source includes a light-collecting element. The lighting device according to any one of claims 2, 5, and 8, further comprising a solid-state light source that emits light of different wavelengths, and a unit that selectively emits light from each solid-state light source. Lighting equipment. A projection-type image display device comprising the lighting device according to claim 1.

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