JP2005099590A - Illuminating device and projection type image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device capable of enhancing color reproducibility with an auxiliary light source, and to provide a projection type image display device using the illuminating device. <P>SOLUTION: White light source 11 emits substantially parallel white light. An auxiliary light source 12 comprises a plurality of LED chips 12a arranged in an array, and a plurality of lens cells 12b for collimation arranged on the light emitting sides of the respective LED chips 12a. As each LED chip 12a, one that emits light having a red wavelength component that is insufficient in terms of color reproducibility in the white light source 11 is selected. A reflection compounding part 13 has such a structure that a large number of triangular prisms are formed on the surface of a glass substrate, a reflective film having a high reflectivity is deposited on the faces of the triangular prisms opposed to one another in a mountain shape, and the faces are constituted as first and second reflecting faces 13a and 13b. Light emitted from a white light source 11 and light emitted from an auxiliary light source 12 are compounded on a single optical axis by the reflection compounding part 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

An illumination device used for a liquid crystal projector or the like is generally a white lamp such as an ultrahigh pressure mercury lamp, a metal halide lamp, or a xenon lamp, and a parabolic reflector that collimates the irradiation light. Furthermore, 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 that is insufficient from the viewpoint of color reproducibility in a white lamp (particularly a mercury-based discharge lamp) (Patent Document). 1). In addition, there is a projection display apparatus that uses a multi-lamp illumination device that uses a plurality of light sources as the illumination device (see Patent Document 2).
JP 2002-174854 A JP 2002-296679 A

  However, further improvement is required in improving the color reproducibility of a white light source using a light emitting diode as an auxiliary light source.

  An object of this invention is to provide the illuminating device which can improve color reproducibility using an auxiliary light source, and a projection type video display apparatus using the same in view of said situation.

  In order to solve the above problems, the illumination device of the present invention includes a first light source and a second light source that emit substantially parallel light, a first optical element that guides the emitted light from the first light source in a specific direction, and the And an optical member alternately arranged with second optical elements for guiding the emitted light from the second light source in a direction parallel to the specific direction, the white light source as the first light source, An auxiliary light source that emits light having a wavelength component that is insufficient from the viewpoint of color reproducibility in the white light source is provided as the two light sources.

  If it is said structure, the auxiliary light from an auxiliary light source will be utilized without waste by the said optical member with the white light from a white light source, and it synthesize | combines on one optical axis.

  The illumination device of the present invention includes a first light source that emits substantially parallel light, an optical member in which a plurality of optical elements that guide emitted light from the first light source in a specific direction are formed at predetermined intervals, and the optical element. A second light source group that is disposed in between and emits substantially parallel light in a direction parallel to the specific direction, and includes a white light source as the first light source, and the white light source as the second light source group And an auxiliary light source that emits light having a wavelength component that is considered insufficient from the viewpoint of color reproducibility.

  If it is said structure, the auxiliary light from an auxiliary light source will be utilized without waste by the said optical member with the white light from a white light source, and it synthesize | combines on one optical axis.

  The auxiliary light source may be formed by arranging a plurality of solid light sources that emit substantially parallel light.

  In addition, the projection display apparatus of the present invention includes any one of the above-described illumination apparatuses as the illumination apparatus in the projection display apparatus that projects the light emitted from the illumination apparatus by modulating the light valve. It is characterized by.

  According to the present invention, it is possible to perform illumination with improved color reproducibility using an auxiliary light source, and there is an effect that high-quality image projection can be performed in the projection display apparatus.

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

  FIG. 1 is a schematic configuration diagram showing an illumination apparatus and a projection display apparatus according to an embodiment of the present invention. The illumination device 1 includes a white light source 11, an auxiliary light source 12, and a reflection / synthesis unit 13. The projection display apparatus 10 includes the illumination device 1, an integrator lens 14, a polarization conversion device 15, condenser lenses 2, 3, 4, a liquid crystal display panel 5, and a projection lens 6. . In this figure, for simplicity of explanation, the optical system is shown in a single-plate configuration. However, in a so-called three-plate configuration, a color separation optical system and a color synthesis system are added.

  The integrator lens 14 is composed of a pair of fly-eye lenses 14a and 14b, and each pair of convex lenses is designed to irradiate the entire surface of the liquid crystal display panel 5 with light from the light sources 11 and 12, and is emitted from the light sources 11 and 12. The partial luminance unevenness existing in the light is averaged to reduce the light amount difference between the center and the peripheral portion of the screen, and the color light of the auxiliary light source 12 is mixed with the white light without unevenness.

  The polarization conversion device 15 includes 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, all the light is converted to P-polarized light. However, by providing the phase difference plate position at the P-polarized light emission position, all light can be converted to S-polarized light.

  The light emitted from the illumination device 1 reaches the liquid crystal display panel 5 through the condenser lenses 2, 3 and 4. The light incident on the liquid crystal display panel 5 undergoes light intensity modulation in accordance with the light transmittance set in each pixel to be image light, and is projected onto a screen (not shown) by the projection lens 6.

  Hereinafter, the lighting device 1 will be described in detail. The light emitting part in the white light source 11 is composed of an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like, and the irradiation light is emitted as substantially parallel light by a parabolic reflector.

  The auxiliary light source 12 is formed by arranging LED chips 12a in an array and arranging collimating lens cells 12b on the light emitting side of each LED chip 12a. The auxiliary light source 12 is formed in a similar shape to the integrator lens 14, for example. The LED chips 12a are molded with a transparent resin, and the transparent resin is formed in a convex shape to form the lens cell 12b.

  As the LED chip 12a, one that emits a red wavelength component that is considered insufficient from the viewpoint of color reproducibility in the white light source 11 is selected. Of course, instead of providing only LED chips that emit light of the same wavelength, LEDs having different emission light wavelengths in the red light range may be arranged. Further, a plurality of LEDs may be divided into groups so that a switch can be provided so that energization can be selectively performed so that the LEDs can selectively emit light. According to this, the color reproduction adjustment range can be expanded by increasing or decreasing the light amount of the predetermined wavelength component. In addition, it is also possible to form the auxiliary light sources 12 by arranging the molded LEDs individually produced in an array.

  For example, the reflection combining unit 13 is provided with a number of triangular prisms on the surface of the glass substrate, and a reflective film having a high reflectance is deposited on the surface of the triangular prisms facing the chevron. Two reflecting surfaces 13a and 13b are provided. The light sources 11 and 12 are on a plane in which the optical axis of the light beam emitted from the light source 11 and the optical axis of the light beam emitted from the light source 12 are both perpendicular to the reflection surfaces 13 a and 13 b of the reflection combining unit 13. They are arranged symmetrically so as to form a predetermined angle α with the vertical line O (in the figure, the optical axis of the reflected light and the vertical line O are shown in common). The light emitted from the white light source 11 is reflected by the reflecting surface 13a and reflected in a direction parallel to the perpendicular line O, and the light emitted from the auxiliary light source 12 is reflected by the reflecting surface 13b and parallel to the perpendicular line O. The angle (vertical angle) of the surfaces (reflecting surfaces 13a, 13b) facing the chevron in the triangular prism-shaped portion and the positions of the light sources 11, 12 are set. That is, the reflection combining unit 13 combines the light emitted from the white light source 11 and the light emitted from the auxiliary light source 12 without waste on one optical axis.

  In the above embodiment, both the first and second light sources 11 and 12 are combined using the reflection combining unit 13, but for example, a transparent member in which a large number of triangular prisms are provided on the glass substrate surface. , And the light from the first and second light sources 11 and 12 may be transmitted and refracted to be combined.

  FIG. 2 shows another embodiment. The reflection synthesis unit 23 shown in FIG. 2 is the reflection synthesis unit 13 in which the first reflection surface 13a is left as the reflection surface 23a, and the recess 23b is formed in the region where the second reflection surface 13b is located. Equivalent to. Each recessed portion 23b is provided with a molded LED 24.

  The light emitted from the white light source 11 is reflected by the reflecting surface 23a. The LEDs 24 emit substantially parallel light in a direction parallel to the reflection direction. The LEDs 24... Constitute auxiliary light sources and emit light having a wavelength component that is insufficient from the viewpoint of color reproducibility in the white light source 11. White light and auxiliary light are mixed evenly by an integrator lens (not shown) and guided to the liquid crystal display panel.

  In the above embodiment, the transmissive liquid crystal display panel 5 is used. However, the present invention is not limited to this, and a reflective liquid crystal display panel may be used, or instead of the liquid crystal display panel, for example, A light modulation element of a type that individually drives the micromirrors may be used or used. The solid light source is not limited to a light emitting diode (LED). Moreover, not only a point light source but a surface light source (organic EL etc.) is good also as an auxiliary light source. A solid light source with high color purity is preferably used as an auxiliary light source, but a lamp light source may be used as an auxiliary light source if the color purity is high.

It is explanatory drawing which showed the optical system of the illuminating device and projection type video display apparatus of embodiment of this invention. It is explanatory drawing which showed other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 5 Liquid crystal display panel 6 Projection lens 11 White light source 12 Auxiliary light source 13 Reflection composition part 14 Integrator lens 23 Reflection composition part 24 LED

Claims (4)

A first light source and a second light source that emit substantially parallel light; a first optical element that guides light emitted from the first light source in a specific direction; and light emitted from the second light source in a direction parallel to the specific direction. Optical members arranged alternately with the second optical elements to be guided, provided with a white light source as the first light source, and insufficient as a second light source from the viewpoint of color reproducibility in the white light source. An illumination device comprising an auxiliary light source that emits light having a wavelength component. A first light source that emits substantially parallel light; an optical member in which a plurality of optical elements that guide emitted light from the first light source in a specific direction are formed; and a specific direction disposed between the optical elements and the specific direction. A second light source group that emits substantially parallel light in a parallel direction, and includes a white light source as the first light source, and the second light source group is insufficient from the viewpoint of color reproducibility in the white light source. An illuminating device comprising an auxiliary light source that emits light having a wavelength component. 3. The illuminating device according to claim 1, wherein the auxiliary light source includes a plurality of solid light sources that emit substantially parallel light. 4. A projection display apparatus for projecting light emitted from a lighting device by modulating the light with a light valve, comprising the lighting device according to claim 1 as the lighting device. Projection display device.

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