JP4115420B2 - Illumination device and projection display device - Google Patents

Description

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

  FIG. 9 shows a configuration example of a conventional projection display apparatus. The light emitting unit 2 of the light source 1 is composed of an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp, or the like.

  The integrator lens 4 is composed of a pair of lens groups 4a and 4b, and each pair of lenses guides light emitted from the light source 1 to the entire surface of a liquid crystal light valve to be described later. The light passing through the integrator lens 4 is guided to the dichroic mirror 8 after passing through the polarization conversion device 5 and the condenser lens 6.

  The polarization conversion device 5 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 polarization separation film of the PBS array passes, for example, P-polarized light out of the light from the integrator lens 4 and changes the optical path of S-polarized light by 90 °. The S-polarized light whose optical path has been changed is reflected by an adjacent polarization separation film, converted into P-polarized light by the retardation plate provided on the front side (light emitting side), and emitted. On the other hand, the P-polarized light transmitted through the polarization separation film is emitted as it is. That is, in this case, almost all light is converted to P-polarized light. In the above example, the configuration for converting all the light into P-polarized light has been described. However, the configuration may be such that all the light is converted into S-polarized light by providing the phase difference plate position at the P-polarized light emission position.

  The dichroic mirror 8 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 dichroic mirror 8 is reflected by the total reflection mirror 9 to change the optical path. The red light reflected by the total reflection mirror 9 is optically modulated by passing through the condenser lens 10 and the transmissive liquid crystal light valve 7R for red light. On the other hand, the light in the cyan wavelength band reflected by the dichroic mirror 8 is guided to the dichroic mirror 11A.

  The dichroic mirror 11A 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 dichroic mirror 11A is guided through the condenser lens 12 to the transmissive liquid crystal light valve 7G for green light, and is modulated by being transmitted therethrough. The light in the blue wavelength band that has passed through the dichroic mirror 11A passes through the relay lens 13, the total reflection mirror 14, the relay lens 15, the total reflection mirror 16, and the condenser lens 17, and a transmissive liquid crystal light valve 7B for blue light. The light is modulated by being transmitted through the light.

  The modulated light (each color video light) modulated by passing through the liquid crystal display panels 7R, 7G, and 7B is synthesized by the dichroic prism 18 to become color video light. The color image light is enlarged and projected by the projection lens 19 and projected and displayed on the screen.

In addition, as a conventional projection display apparatus, a configuration is proposed in which red light from a red LED, green light from a green LED, and blue light from a blue LED are guided in the same direction using a cross dichroic prism. (See Patent Document 1).
JP 2002-189263 A

  However, in the above conventional configuration, an expensive cross dichroic mirror (or cross dichroic prism) or dichroic mirror is required in the optical system for guiding each color light to the display panel. Further, there is a drawback that it is difficult to reduce the size of the light source.

  In view of the above circumstances, an object of the present invention is to provide an illumination device and a projection display device that do not require a dichroic optical system and can reduce the size of a light source.

  In order to solve the above-described problems, an illumination device according to the present invention includes a solid-state light-emitting element array that emits first color light and a solid-state light-emitting element array that emits second color light in an illumination device that generates three primary color lights. The solid-state light-emitting element array that emits the third color light is provided with any two solid-state light-emitting element arrays close to each other (hereinafter referred to as the first configuration in this section). ).

  Since the solid-state light-emitting element array that emits the first color light, the solid-state light-emitting element array that emits the second color light, and the solid-state light-emitting element array that emits the third color light. There is no need to use expensive cross dichroic mirrors (or cross dichroic prisms) or dichroic mirrors. Moreover, since two of the three solid-state light emitting element arrays are provided with their sides close to each other, the lighting device can be miniaturized.

  In the illuminating device having the first configuration, the two solid-state light emitting element arrays may be arranged so as to form a cross shape with the central portions of the sides close to each other. The two solid-state light emitting element arrays may be composed of line-shaped light emitting element groups arranged in a line, and the line-shaped light emitting element groups may be alternately arranged. Alternatively, in the two solid light emitting element arrays, the central part of the lower side of one solid light emitting element array and the central part of the upper side of the other solid light emitting element array may be close to each other.

  In the illuminating device having the first configuration, the two solid-state light emitting element arrays may be arranged so as to form an L shape with the entire sides close to each other.

  According to another aspect of the present invention, there is provided an illumination device that generates three primary color lights, a solid-state light-emitting element array that emits first color light, a solid-state light-emitting element array that emits second color light, and a third color light. The solid-state light emitting element array is provided with the sides or corners close to each other (hereinafter referred to as the second configuration in this section).

  In the second configuration, the three solid-state light-emitting element arrays are arranged so that the central portions of the sides are close to each other, and the solid-state light-emitting element array that emits the second color light is a solid-state light-emitting element array that emits the first color light The solid state light emitting device array that emits the third color light is positioned by rotating a predetermined angle counterclockwise with respect to the solid state light emitting device array that emits the first color light. You may do it. In such a configuration, the three solid-state light emitting element arrays may be composed of line-shaped light emitting element groups arranged in a line, and the line-shaped light emitting element groups may be alternately arranged. Alternatively, the three solid-state light emitting element arrays may be arranged in three stages.

  In the second configuration, the three solid-state light emitting element arrays may be arranged so as to form a U shape by bringing the entire sides close to each other. In the second configuration, the three solid-state light emitting element arrays may be arranged in the same plane with their corners close to each other.

  In addition, the illumination device having these configurations may include a polarization conversion device that aligns the emitted light of each solid-state light emitting element array in a specific linear polarization direction.

  In addition, a projection display apparatus according to the present invention is obtained through any one of the above-described illumination devices, an optical system that guides colored light from each solid-state light emitting element array of the illumination device to a light valve, and the light valve. And a projection optical system that synthesizes and projects each color image light. In such a projection display apparatus, each solid state light emitting element array may be configured to alternately turn on and off in a predetermined time unit.

  According to the present invention, it is not necessary to use an expensive cross dichroic mirror (or cross dichroic prism) or dichroic mirror in the optical system for guiding each color light to the light valve. Also, since two or three of the three solid state light emitting element arrays are provided with their sides or corners close to each other, the lighting device can be reduced in size, and the projection display device can be easily reduced in size. The effect of becoming.

(Embodiment 1)
Hereinafter, a projection display apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. For convenience of explanation, the same elements as those shown in FIG. 9 of the conventional example are denoted by the same reference numerals.

  FIG. 1 is a view showing an optical system of a three-plate type projection display apparatus. This projection-type image display apparatus includes three LED arrays 21R, 21G, and 21B as light sources (hereinafter, the symbol “21” is used to indicate each LED array without specifying it). The LED array 21R emits red light, the LED array 21G emits green light, and the LED array 21B emits blue light.

  The LED array 21 has a plurality of LEDs (light emitting diodes) arranged in the same plane. The outgoing optical axis (principal ray) of each LED is set to be orthogonal to the plane (LED arrangement plane). An integrator lens 4 is provided on the light emitting side of each LED array 21. Of course, although not shown, the polarization conversion device 5 can also be arranged. In FIG. 1, condenser lenses 22, 23, and 24 are appropriately disposed on the light emission side of the integrator lens 4, and a total reflection mirror 11B is provided instead of the dichroic mirror 11A of FIG.

  The LED array 21R and the LED array 21G are close to each other at the center of each side, and form a cross shape in plan view.

  The red light emitted from the LED array 21R is reflected by the total reflection mirror 9 to change the optical path. The red light reflected by the total reflection mirror 9 is optically modulated by passing through the condenser lens 10 and the transmissive liquid crystal display panel 7R for red light.

  The green light emitted from the LED array 21G is reflected by the total reflection mirror 11B and the optical path is changed. The green light reflected by the total reflection mirror 11B passes through the condenser lens 12 and passes through the transmissive liquid crystal display panel 7G for green light, and is optically modulated.

  The blue light emitted from the LED array 21B is reflected by the total reflection mirror 16 to change the optical path. The blue light reflected by the total reflection mirror 16 is light-modulated by passing through the condenser lens 17 and the transmissive liquid crystal display panel 7B for blue light.

Each of the liquid crystal display panels 7R, 7G, and 7B includes an incident-side polarizing plate, a panel portion in which liquid crystal is sealed between a pair of glass substrates (pixel electrodes and alignment films are formed), an outgoing-side polarizing plate, Comprising. The modulated light (each color video light) modulated by passing through the liquid crystal display panels 7R, 7G, and 7B is synthesized by the dichroic prism 18 to become color video light. The color image light is enlarged and projected by the projection lens 19, and is projected and displayed on the screen. The LED array 21R and the LED array 21G having the cross shape described above constitute each array as shown in FIG. You may have the structure arrange | positioned 90 degree crossing alternately for every LED group for 1 line. Of course, it is not limited to one line. Or as shown in FIG. 3, you may have the structure arrange | positioned 90 degree crossing in the state which contact | connected the lower side center part of LED array 21R, and the upper side center part of LED array 21G.

(Embodiment 2)
Hereinafter, a projection display apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. For convenience of explanation, the same elements as those shown in FIG. 1 of the first embodiment are denoted by the same reference numerals.

  FIG. 4 is a view showing an optical system of a three-plate projection display apparatus. This projection display apparatus includes three LED arrays 21R, 21G, and 21B as light sources. The difference from the configuration of FIG. 1 is that the LED array 21R and the LED array 21G are provided with their left and right sides close to each other. With such a configuration, as shown in FIG. 5, the LED array 21R and the LED array 21G can have more LEDs. Since the fly-eye lenses of the integrator lens provided corresponding to the LED array 21R and the LED array 21G have a longer distance than the configuration of FIG. 1, a lens design corresponding to such an arrangement is performed. .

(Embodiment 3)
A projection display apparatus according to Embodiment 3 of the present invention will be described below with reference to FIG. In FIG. 6, some optical elements are omitted. For the sake of convenience of explanation, the same elements as those shown in FIG.

  FIG. 6 is a diagram showing an optical system of a three-plate type projection display apparatus. This projection display apparatus includes three LED arrays 21R, 21G, and 21B as light sources. The LED array 21G faces the front with respect to the liquid crystal display panel 7G. The LED array 21R is provided at a position rotated 30 ° clockwise relative to the LED array 21G. The LED array 21B is provided at a position rotated 30 ° counterclockwise with respect to the LED array 21G. The LED arrays 21R, 21G, and 21B are provided in a state similar to the arrangement form as shown in FIG. 2 or FIG.

  The normal line of the total reflection mirror 31 that receives red light is inclined by 30 ° with respect to the outgoing optical axis of the LED array 21R. Further, the normal line of the total reflection mirror 31 is also inclined by 30 ° with respect to the liquid crystal display panel 7R. The red light emitted from the LED array 21R is reflected by the total reflection mirror 31 and enters the liquid crystal display panel 7R perpendicularly.

  The normal line of the total reflection mirror 32 that receives blue light is inclined by 30 ° with respect to the outgoing optical axis of the LED array 21B. Further, the normal line of the total reflection mirror 32 is also inclined by 30 ° with respect to the liquid crystal display panel 7B. The blue light emitted from the LED array 21B is reflected by the total reflection mirror 32 and enters the liquid crystal display panel 7B perpendicularly.

  Also in the above optical system, the integrator lens 4 can be provided for each LED array 21, and the polarization conversion device 5 can also be provided.

(Embodiment 4)
Hereinafter, a projection display apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. In FIG. 7, some optical elements are omitted. For the sake of convenience of explanation, the same elements as those shown in FIG.

  FIG. 7A is a perspective view showing an optical system of a three-plate projection display apparatus, and FIG. 7B is a rear view. This projection display apparatus includes three LED arrays 21R, 21G, and 21B as light sources. The LED array 21R is provided above the liquid crystal display panel 7R in substantially the same plane as the liquid crystal display panel 7R. The LED array 21G is provided above the liquid crystal display panel 7G in substantially the same plane as the liquid crystal display panel 7G. The LED array 21B is provided above the liquid crystal display panel 7B in substantially the same plane as the liquid crystal display panel 7B. These LED arrays 21R, 21G, and 21B have their sides close to each other and have a U shape in plan view.

  The total reflection mirror 33R is disposed at an angle of 45 ° with respect to the emission optical axis on the light emission side of the LED array 21R, and the total reflection mirror 34R is arranged on the light incident side of the liquid crystal display panel 7R. It is arranged at an angle of 45 ° to the angle. That is, the red light emitted from the LED array 21R is reflected by the total reflection mirrors 33R and 34R and enters the liquid crystal display panel 7R.

  The total reflection mirror 33G is disposed on the light exit side of the LED array 21G so as to be inclined by 45 ° with respect to the output optical axis. The total reflection mirror 34G is disposed on the light incident side of the liquid crystal display panel 7G. It is arranged at an angle of 45 ° to the angle. That is, the green light emitted from the LED array 21G is reflected by the total reflection mirrors 33G and 34G and enters the liquid crystal display panel 7G.

  The total reflection mirror 33B is disposed on the light exit side of the LED array 21B so as to be inclined by 45 ° with respect to the exit optical axis. The total reflection mirror 34B is disposed on the light incident side of the liquid crystal display panel 7B. It is arranged at an angle of 45 ° to the angle. That is, the blue light emitted from the LED array 21B is reflected by the total reflection mirrors 33B and 34B and enters the liquid crystal display panel 7B.

  Also in the above optical system, the integrator lens 4 can be provided for each LED array 21, and the polarization conversion device 5 can also be provided.

(Embodiment 5)
A projection display apparatus according to Embodiment 5 of the present invention will be described below with reference to FIG. In FIG. 8, some optical elements are omitted. For the sake of convenience of explanation, the same elements as those shown in FIG.

  FIG. 8 is a perspective view showing an optical system of a three-plate type projection display apparatus. This projection display apparatus includes three LED arrays 21R, 21G, and 21B as light sources. The LED array 21R is provided perpendicular to the panel surface with its side close to the upper side of the panel surface of the liquid crystal display panel 7R. The LED array 21G is provided perpendicular to the panel surface with its side close to the upper side of the panel surface of the liquid crystal display panel 7G. The LED array 21B is provided perpendicular to the panel surface with its side close to the upper side of the panel surface of the liquid crystal display panel 7B. These LED arrays 21R, 21G, and 21B are arranged such that their corners are close to each other in the same plane.

  The total reflection mirror 35R is disposed on the light exit side of the LED array 21R so as to be inclined by 45 ° with respect to the exit optical axis. ° Arranged at an angle. That is, the red light emitted from the LED array 21R is reflected by the total reflection mirror 35R and enters the liquid crystal display panel 7R.

  The total reflection mirror 35G is disposed on the light exit side of the LED array 21G so as to be inclined by 45 ° with respect to the exit optical axis, and on the light entrance side of the liquid crystal display panel 7G, 45% with respect to the entrance optical axis. ° Arranged at an angle. That is, the green light emitted from the LED array 21G is reflected by the total reflection mirror 35G and enters the liquid crystal display panel 7G.

  The total reflection mirror 35B is disposed on the light exit side of the LED array 21B so as to be inclined by 45 ° with respect to the exit optical axis, and on the light entrance side of the liquid crystal display panel 7B, 45% with respect to the entrance optical axis. ° Arranged at an angle. That is, the blue light emitted from the LED array 21B is reflected by the total reflection mirror 35B and enters the liquid crystal display panel 7B.

  Also in the above optical system, the integrator lens 4 can be provided for each LED array 21, and the polarization conversion device 5 can also be provided. In FIG. 8, the LED array 21 is provided substantially flush with the upper surface of the cross dichroic prism 18, but may be disposed above the upper surface of the cross dichroic prism 18.

  In the projection display apparatus described above, the LED arrays 21R, 21G, and 21B are not limited to being always lit. In each LED array 21, lighting and extinguishing may be alternately repeated in predetermined time units. When such a lighting process is performed, the afterimage phenomenon can be reduced.

It is explanatory drawing which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is the perspective view which expanded and showed the illuminating device of embodiment of this invention. It is the perspective view which expanded and showed the illuminating device of embodiment of this invention. It is explanatory drawing which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is the perspective view which expanded and showed the LED array. It is explanatory drawing which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is the figure which showed the optical system of the projection type video display apparatus of embodiment of this invention, Comprising: The figure (a) is a perspective view, The figure (b) is a rear view. It is the perspective view which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is explanatory drawing which showed the optical system of the conventional projection type video display apparatus.

Explanation of symbols

4 Integrator Lens 5 Polarization Conversion Device 7R Red Liquid Crystal Display Panel 7G Green Liquid Crystal Display Panel 7B Blue Liquid Crystal Display Panel 18 Cross Dichroic Prism 19 Projection Lens 21R Red LED Array 21G Green LED Array 21B Blue LED array

Claims (4)

A lighting device for generating three primary light, rectangular shape for emitting the solid-state light-emitting element array of rectangular shape for emitting the first color light, a solid-state light-emitting element array of rectangular shape for emitting the second color light, the third color light The two solid-state light-emitting element arrays are arranged so as to form an L-shape with one whole side close to each other,
A transmissive illumination object is arranged on each of the three surfaces of the cross dichroic optical element, and the respective solid-state light emitting element arrays are different from each other with the main optical axes of the first to third color lights existing in the same plane. Illuminate the object to be illuminated,
Each color light emitted from the two L-shaped solid light emitting element arrays is guided to a corresponding illumination object by forming an L-shaped optical path,
Illumination characterized in that each pair of fly-eye lenses is arranged so as not to block the other optical path across a portion where each color light emitted from the two L-shaped solid light emitting element arrays intersects. apparatus. The illuminating device according to claim 1, further comprising a polarization conversion device that aligns outgoing light of each solid-state light emitting element array in a specific linear polarization direction . A projection apparatus comprising: the illumination device according to claim 1; and a projection optical system that synthesizes and projects each color image light obtained through a light valve as the illumination object. Type image display device . 4. The projection display apparatus according to claim 3, wherein each solid-state light emitting element array is configured to repeatedly turn on and off alternately in a predetermined time unit.

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