JP2007003847A - Illuminator and projection type image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical illuminator using a solid-state light emitting element such as a light emitting diode, and to provide a projection type image display device using the illuminator. <P>SOLUTION: A first light source 102 and a first polarization converter 103 are arranged on the first light incident surface of a polarized light synthesizing element 101, and a second light source 102 and a second polarization converter 103 are arranged on the second light incident surface of the element 101. The light source 102 functions as a light source for emitting white light or respective color light beams to become the white light. The polarization converter 103 comprises a polarizing beam splitter array. A π cell 105 is arranged on the light emitting side of a rod integrator 104. The π cell 105 functions as an element where the functional state is switched between the functional state to rotate the polarizing direction of the received light by 90° and the functional state not to rotate the polarizing direction of the light in accordance with the ON/OFF of the power. The S-polarized light or P-polarized light from the light source is unified into either by the π cell 105, then, supplied to a liquid crystal display panel 3F. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  As an illuminating device used for a liquid crystal projector or the like, a lighting device such as an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like and a parabolic reflector that collimates the irradiation light is generally used. Further, in such an illumination device, in order to reduce unevenness in the amount of light on the irradiation surface, an integration function by a pair of fly-eye lenses (a plurality of illumination areas of a predetermined shape sampled and formed in a plane by an optical device on an illumination object) Some have a function of superimposing and condensing). Furthermore, in recent years, it has been attempted to use a light emitting diode (LED) as a light source from the viewpoint of power saving or the like (see Patent Document 1).

JP-A-10-186507

  However, the actual situation is that a practical lighting device has not been obtained using a light emitting diode.

  In view of the above circumstances, an object of the present invention is to provide a practical illumination device using a solid light-emitting element such as a light-emitting diode and a projection-type image display device using the same.

  In order to solve the above-described problem, the illumination device of the present invention includes a plurality of light sources that are composed of one or a plurality of solid-state light-emitting elements and are arranged in different directions, and lighting control that causes the solid-state light-emitting elements to emit light in pulses. Means, a first polarization conversion device that converts light emitted from the first light source of the plurality of light sources into polarized light in a first direction, and light emitted from a second light source different from the first light source. A second polarization conversion device that converts the polarized light in the second direction orthogonal to the first direction, and the light emitted from the first light source and converted into the polarized light in the first direction by one of the functions of transmission and reflection And an optical path changing means for guiding the light emitted from the second light source and polarized in the second direction to the specific optical path by the other function (hereinafter referred to as this section). In the first configuration).

  The amount of light emitted from the illuminating device increases because the amount of peak light increases when a pulsed light is emitted by flowing a large current instantaneously, rather than by flowing a steady current through the solid state light emitting element. In addition, another solid-state light emitting element can emit a pulse during a period from when one solid-state light-emitting element emits a pulse until the next pulse is emitted, and the amount of light can be increased compared to a total steady-state emission. Become. Here, when a plurality of light sources are directed in the same direction (the optical axes of the respective light sources are substantially parallel), the substantial light emitting area becomes large with respect to the illumination object, and the luminous flux guided to the illumination object Parallelism is easily lost. On the other hand, in such an invention, since the plurality of light sources are directed in different directions and the optical path changing means is provided, the substantial light emitting area is smaller than the illumination object, and the light flux guided to the illumination object. The degree of parallelism can be improved. In other words, the distance from the illumination device to the illumination object can be shortened.

  In the first configuration, the emitted light amounts of the first light source and the second light source are set so that the light amounts of the polarized light in the first direction and the polarized light in the second direction obtained through the optical path changing unit are equal. They may be different from each other.

  In the first configuration and the subordinate configuration, the first fly-eye lens provided on the light emitting side of each light source and the first fly-eye lens provided on the specific optical path and paired with light. And a second fly-eye lens that integrates and guides the light to the object to be illuminated. Alternatively, a cylindrical or rod-shaped optical integrator may be provided on the specific optical path.

  In the first configuration and the subordinate configuration thereof, a switching polarization rotator in which a functional state in which the polarization direction of received light is rotated by 90 degrees and a functional state in which the light is not rotated are switched by ON / OFF of energization, and the switching polarization rotator A switching circuit that controls the switching polarization rotation element is disposed on the specific optical path, and the lighting control means performs lighting control so as to shift the pulse emission timing of the first light source and the second light source, The switching circuit may be configured to turn on / off the switching polarization rotation element in synchronization with the pulse emission timing of the solid state light emitting element, and to unify the polarization direction of light obtained through the switching polarization rotation element (hereinafter, This is referred to as the second configuration in this section).

  In the first configuration and the subordinate configuration (excluding the second configuration), each light source may emit the same color of light (hereinafter referred to as the third configuration in this section). In the first configuration and the subordinate configuration (excluding the second configuration), each light source may emit white light or each color light that becomes white (hereinafter referred to as a fourth configuration in this section).

  The projection display apparatus of the present invention further includes a plurality of illumination devices that emit different color lights, and at least one of the illumination devices is the illumination device having the third configuration, and each color light from each illumination device. Is modulated by a display panel, and each color-modulated light is combined and projected.

  The projection display apparatus of the present invention further includes a plurality of illumination devices that emit different color lights, and at least one of the illumination devices is the illumination device having the third configuration, and each color light from each illumination device. The light beam is guided in the same direction, light-modulated by a single display panel, and the modulated light is projected.

  The projection display apparatus of the present invention includes the illumination device having the fourth configuration, and modulates the white light from the illumination device or each color light that becomes white light with a single display panel. It is characterized by projecting.

  In addition, a projection display apparatus according to the present invention includes the illumination device having the fourth configuration, separates white light from the illumination device into different color lights, and modulates each color light with a display panel. The modulated light is combined and projected.

  In any one of the above-described projection display apparatuses, the display panel includes a liquid crystal display panel having no incident-side polarizing plate and a panel drive circuit that drives the liquid crystal display panel, and the lighting control unit includes a first light source. And the light emission timing of the second light source are shifted, and the panel drive circuit is configured to apply a light beam polarized in the first direction to the polarizing plate on the emission side when the polarized light in the first direction is incident on the liquid crystal display panel. Either a video signal generated for a liquid crystal display panel whose incident-side polarization direction crosses or a video signal generated for a liquid crystal display panel whose incident-side polarization direction is parallel to the output-side polarizing plate While a signal is supplied to the liquid crystal display panel, when the polarized light in the second direction is incident on the liquid crystal display panel, the other video signal is supplied to the liquid crystal display panel. It may be supplied to.

  In the second configuration, each light source may emit the same color of light (hereinafter referred to as the fifth configuration in this section). In the second configuration, each light source may emit white light or each color light that becomes white (hereinafter, referred to as a sixth configuration in this section).

  In addition, the projection display apparatus of the present invention includes a plurality of illumination devices that emit different color lights, and at least one of the illumination devices is an illumination device having a fifth configuration, and each color light from each illumination device is received. Each of the display panels is light-modulated, and each color-modulated light is combined and projected.

  In addition, the projection display apparatus of the present invention includes a plurality of illumination devices that emit different color lights, and at least one of the illumination devices is an illumination device having a fifth configuration, and each color light from each illumination device is received. It is characterized in that the light is modulated in a single display panel guided in the same direction and this modulated light is projected.

  In addition, the projection display apparatus of the present invention includes the illumination device having the sixth configuration, and modulates the white light from the illumination device or each color light that becomes white with a single display panel. It is configured to project.

  The projection display apparatus of the present invention includes a lighting device having a sixth configuration, separates white light from the lighting device into different color lights, and modulates each color light with a display panel. It is configured to synthesize and project light.

  In these projection type video display devices including the illumination device of the fifth configuration or the sixth configuration, a liquid crystal display panel may be provided as the display panel.

  In the above-described projection display apparatus, the level of the video signal supplied to the display panel when receiving polarized light in the first direction and the display panel when receiving polarized light in the second direction are received. The levels of the video signals supplied to the video signal may be different from each other. In the illumination device or the projection display apparatus, the optical path changing means may be a glass cube type polarization beam splitter.

  As described above, according to the present invention, since the solid-state light emitting element has a plurality of light sources and emits pulses, the total amount of light is increased compared to the steady light emission of the solid-state light emitting element. obtain. The substantial light emitting area can be reduced with respect to the illumination object, and the parallelism of the light beam guided to the illumination object can be improved.

  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 an explanatory view showing the illumination device 100A. The first light incident surface of the polarization combining element (optical path changing means) 101 may be denoted by the first light source 102 (hereinafter may be denoted by reference numeral 102A) and the first polarization conversion device 103 (hereinafter denoted by reference numeral 103A). And the second light source 102 (hereinafter may be denoted by reference numeral 102B) and the second polarization conversion device 103 (hereinafter may be denoted by reference numeral 103B). Is arranged. The first light incident surface and the second light incident surface intersect at 90 °. Further, the polarization composition film (polarization separation film) of the polarization composition element 101 is inclined by 45 ° with respect to the outgoing main optical axes of the two light sources 102. A rod integrator 104 is disposed on the light emitting surface of the polarization beam combining element 101 (this light emitting surface faces the first light incident surface). A so-called wire grid polarizing plate can be used as the polarization combining element 101. In this embodiment, a glass cube type polarization beam splitter is used. If this glass cube type polarization beam splitter is used, a polarization combining film is used. Thus, total reflection can be expected, and the rod integrator 104 can be shortened. The rod integrator 104 may be bonded by a transparent adhesive (having the same or different refractive index as that of the glass constituting the rod integrator 104 and the polarization combining element 101). Further, at least the light exit surface of the rod integrator 104 is formed in a square shape, and the aspect ratio of the square light exit surface is substantially the same as the aspect ratio of the image display element.

  The light source 102 is a light source that emits white light or each color light that becomes white light, and has a configuration in which, for example, four LED chips are arranged in the same plane as shown in FIG. In this example, one of the four LED chips emits red light, the other emits blue light, and the remaining two emit green light. The two LED chips that emit green light are arranged obliquely. The four LED chips are arranged on the heat sink 102a. The LED chip may have a photonic crystal structure.

  As shown in FIG. 3, the polarization conversion device 103 includes a polarization beam splitter array (hereinafter referred to as a PBS array). Each polarization separation film in this PBS array passes, for example, P-polarized light out of the light from the light source 102, 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 (or reflection film) and emitted as it is. On the other hand, the P-polarized light that has passed through the polarization separation film is converted into S-polarized light by the phase difference plate (1 / 2λ plate) 103a provided on the front side (light emission side) thereof and emitted. That is, in this case, almost all light is converted to S-polarized light. The polarizing beam splitter is configured by a so-called wire grid polarizing plate, a polarization separating multilayer film, or the like.

  Here, the first polarization conversion device 103A is arranged so that light that becomes P-polarized light is supplied from the first light source 102A to the polarization composition film (polarization separation film) in the polarization composition element 101. Similarly, the second polarization conversion device 103B is arranged so that light that becomes S-polarized light is supplied from the second light source 102B to the polarization combining film (polarization separation film).

  An LED lighting control circuit (not shown) causes the first light source 102A and the second light source 102B in the illumination device 100A to alternately emit pulses. FIG. 4 shows the on / off state of the first light source 102A and the second light source 102B in the illumination device 100A. Pulse light emission is a method in which a large current is input to the LED chip in a short time, and the peak light emission amount is increased as compared with steady light emission of the LED chip. However, a predetermined interval is required from the pulse emission to the next pulse emission. In order to fill this interval, the first light source 102A and the second light source 102B are made to emit pulses alternately (with the phase shifted by 180 °).

  The period of pulse emission in each light source 102 is 120 Hz. Therefore, the pulse emission period (lighting period) in each light source 102 is about 8.3 msec. As shown in FIG. 4, the pulse emission periods of the first light source 102A and the second light source 102B may slightly overlap each other. According to this, it is possible to prevent an instantaneous light amount decrease (occurrence of a non-light emission state during the pulse light emission period) in the pulse light emission. Note that the polarization directions of the emitted light of the first light source 102A and the second light source 102B are different from each other by 90 °, the installation position of the phase difference plate 103a in the polarization conversion device 103, the first light source 102A and the second light source 102B. The on / off frequency (120 Hz) is merely an example, and is not limited to the above. The same applies to the following configuration examples.

  FIG. 5 is an explanatory view showing a projection display apparatus using the illumination device 100A. This projection display apparatus uses three reflective display elements. White light emitted from the illumination device 100 </ b> A is guided to a total internal reflection (TIR) prism 30 through a lens 23. The white light reflected by the internal total reflection prism 30 is guided to a color separation / combination prism 31 composed of three prisms. Then, each color light is guided to DMD (digital micromirror device) 9R, 9G, 9B for each color, and these reflected lights (each color video light) are incident on the color separation / combination prism 31 again to become full color video light. The light is emitted from the color separation / combination prism 31. The full-color image light emitted from the color separation prism 31 passes through the internal total reflection prism 30 and is enlarged and projected by the projection lens 5.

  By the way, the amount of the P-polarized light transmitted through the polarization combining film (polarization separation film) in the polarization combining element 101 is lower than that of the S-polarized light reflected by the polarization combining film (polarization separation film). It is not desirable that such a light amount difference occurs. Therefore, for example, the amount of P-polarized light and S-polarized light guided to the rod integrator 104 may be equalized by adjusting the power supplied to the second light source 102B. Or you may employ | adopt two light sources 102A * 102B from which emitted light quantity differs by the same supply electric power. Alternatively, correction may be performed so that the luminance signal of the video signal supplied when the first light source 102A is turned on is higher than the luminance signal of the video signal supplied when the second light source 102B is turned on. . That is, the light amount difference between the P-polarized light and the S-polarized light may be eliminated by video signal processing. These processes can also be applied to the following configuration examples.

  FIG. 6 is an explanatory view showing a projection display apparatus using the illumination device 100B. The illumination device 100B has a configuration in which a π cell (switching polarization rotation element) 105 is added to the illumination device 100A described above. The π cell 105 is disposed on the light exit side of the rod integrator 104. The π cell 105 has a structure corresponding to, for example, a structure excluding a polarizing plate in a liquid crystal display panel, and a function state in which the polarization direction of received light is rotated by 90 degrees and a function state in which the polarization direction is not rotated are turned on / off. Switch by OFF. For example, in a state in which the first light source 102A is pulsed (a state in which P-polarized light is supplied to the π cell 105 through the rod integrator 104), no voltage is applied from the π cell SW circuit 121 to the π cell 105 (energization) OFF). At this time, the π cell 105 converts the received P-polarized light into S-polarized light. On the other hand, in a state where the second light source 102B is pulsed (a state where S-polarized light is supplied to the π cell 105 via the rod integrator 104), a voltage is applied to the π cell 105 (energization ON). At this time, the π cell 105 transmits the received S-polarized light as it is. That is, the π cell 105 unifies either the P-polarized light from the first light source 102A or the S-polarized light from the second light source 102B (in the above case, S-polarized light).

  The liquid crystal display panel 3F is a transmissive liquid crystal display panel including a color filter. The incident-side polarizing plate of the liquid crystal display panel 3F transmits S-polarized light. The liquid crystal display panel 3F is driven by the LCD driver 122. Further, the first light source 102A and the second light source 102B are pulse-driven with their phases shifted by 180 ° by the LED lighting circuit 123. The LCD driver 122, the LED lighting circuit 123, and the π cell switch circuit 121 are controlled by the control circuit 124. The ON / OFF edge (switching edge) of the π cell 105 is located at the center of the overlapping portion of the pulse light emission periods of the light sources 102 as shown in FIG. That is, the control circuit 124 controls the π cell switch circuit 121 and the LED lighting circuit 123 so that such control is executed. As described above, when the ON / OFF edge of the π cell 105 is positioned at the center of the overlapping portion of the pulse emission periods of the light sources 102, it is possible to prevent the light amount from decreasing during the inversion period of the π cell 105. Although the π cell 105 is shown as the switching polarization rotation element, the present invention is not limited to this. In addition, although it has been exemplified that the P-polarized light from the first light source 102A and the S-polarized light from the second light source 102B are unified to one (S-polarized light in the above case), they should be unified to either one. The polarization direction of the light from the first light source 102A and the light from the second light source 102B may be unified. For example, when the light incident / exit polarization direction of the liquid crystal display panel is 45 °, the configuration for unifying either the S-polarized light or the P-polarized light is not adopted. A half-wave plate is disposed between them to unify the light in the polarization direction corresponding to the 45 °.

  FIG. 8 is an explanatory view showing a projection display apparatus using the illumination device 100A. This projection display apparatus includes a liquid crystal display panel 3F ′.

  FIG. 9 shows a structure of a general normally white type liquid crystal display panel 3X. The incident-side polarizing plate 3Xa and the outgoing-side polarizing plate 3Xb of the liquid crystal display panel 3X are arranged so that their light transmission axis directions are different from each other by 90 °. When the energization of the pixels of the liquid crystal display panel 3X is OFF, the incident light is converted from the polarization direction by 90 ° and emitted from the exit-side polarizing plate 3Xb, so the display is white. On the contrary, when the energization to the pixel is ON, since the polarization of the incident light is not rotated, the incident light cannot pass through the exit side polarizing plate 3Xb, and the display is black.

  The structure of the liquid crystal display panel 3F ′ corresponds to a structure in which the incident side polarizing plate is removed from the liquid crystal display panel 3X. Then, the LCD driver 122 indicates that the liquid crystal display panel 3F ′ is a normally white type in accordance with the switching timing of the pulse light emission of the first light source 102A and the second light source 102B (switching between P-polarized light and S-polarized light). Switching between the assumed video signal supply and the video signal supply assumed that the liquid crystal display panel 3F 'is a normally black type is performed. That is, the LCD driver 122 generates an image generated for the liquid crystal display panel in which the incident-side polarization direction crosses the output-side polarizing plate when the first-polarized light is incident on the liquid crystal display panel 3F ′. One of the image signals generated for the liquid crystal display panel whose polarization direction on the incident side is parallel to the polarization plate on the signal or the emission side is supplied to the liquid crystal display panel 3F ′, while the second direction When polarized light enters the liquid crystal display panel 3F ', the other video signal is supplied to the liquid crystal display panel.

  More specific description will be given below. In the following description, it is assumed that the exit-side polarizing plate of the liquid crystal display panel 3F ′ transmits S-polarized light. At a timing when the first light source 102A is turned on and P-polarized light is emitted, the LCD driver 122 supplies a normally white video signal to the liquid crystal display panel 3F ′. When a video signal corresponding to white is supplied to the liquid crystal display panel 3F ′ (that is, when energization of the pixels of the liquid crystal display panel 3F ′ is OFF), the P-polarized light incident on the liquid crystal display panel 3F ′ is in the polarization direction. Is converted to S-polarized light by being converted by 90 °, so that it can be transmitted through the output-side polarizing plate, and the display becomes white display. On the other hand, at the timing when the second light source 102B is turned on and S-polarized light is emitted, the LCD driver 122 supplies a normally black video signal to the liquid crystal display panel 3F ′. When a video signal corresponding to white is supplied to the liquid crystal display panel 3F ′ (that is, when energization of the pixels of the liquid crystal display panel 3F ′ is ON), rotation of S-polarized light incident on the liquid crystal display panel 3F ′ occurs. Therefore, the light can be transmitted through the output-side polarizing plate, and the display is white.

  That is, in the case of the projection display apparatus shown in FIG. 8, the LCD driver 122 switches between the normally white video signal supply and the normally black video signal supply in accordance with the alternate lighting timing of the light source 102. Since these two video signals are alternately supplied to the liquid crystal display panel 3F ′ (no incident side polarizing plate), video display can be realized without using the π cell 105.

  FIG. 10 is an explanatory view showing a three-plate type projection display apparatus. This projection display apparatus includes three illumination devices 100C. One of these three illumination devices 100C emits red light, the other emits green light, and the other emits blue light. That is, the illumination device 100C includes a light source (LED chip) that emits each color light as each light source in the configuration of the illumination device 100B. Each color light emitted from each illumination device 100C is guided to the liquid crystal display panels 3R, 3G, and 3B through the π cell 105, respectively. The modulated light (each color video light) modulated by passing through the liquid crystal display panels 3R, 3G, 3B is combined by the cross dichroic prism 4 to become full color video light. The full-color image light is enlarged and projected by the projection lens 5 and displayed on the screen.

  Note that in the three-plate configuration of FIG. 10, a combination of a liquid crystal display panel for each color that does not have an incident-side polarizing plate and the lighting device 100A (see FIG. 8) can be employed.

  Further, it is possible to adopt a configuration in which white light emitted from the illumination device 100A or the illumination device 100B is split into each color light by a dichroic mirror or the like, and each color light is guided to a liquid crystal display panel for each color light. The modulated light (each color video light) modulated by passing through the liquid crystal display panel is combined by a cross dichroic prism to become full color video light. The full-color image light is enlarged and projected by the projection lens and displayed on the screen.

  Further, when using the illumination device 100A that emits the S-polarized light with the S-polarized light and the P-polarized light with the P-polarized light emitted, it is not always necessary to turn on the first light source 102A and the second light source 102B alternately. For example, two combinations of LED chips for emitting white light in each light source are prepared. One set of LED chips is pulsed in the first light source, and at the same time, one set of LED chips is similarly pulsed in the second light source. Then, another set of LED chips is pulse-lighted in the first light source, and at the same time, another set of LED chips is similarly pulsed in the second light source. In this case, although there is still a difference in the amount of light between the P-polarized light and the S-polarized light, the P-polarized light and the S-polarized light emitted at the same time are combined. It is possible to prevent the change from occurring. Such a configuration (control) can also be applied when configuring an illumination device that emits light of each color.

  A time-division full-color projection display apparatus using one DMD and the lighting device 100A can also be configured. For example, when the red light LED chips of the first light source 102A and the second light source 102B are pulse-lit, a red video signal is supplied to the DMD, and the green light of the first light source 102A and the second light source 102B is supplied. When the LED chip for lighting is pulse-lit, a video signal for green is supplied to the DMD, and when the LED chip for blue light of the first light source 102A and the second light source 102B is pulse-lit, the DMD Supplies the video signal for blue. In other words, the video display panel can be time-division driven in synchronization with the pulse lighting timing of the LED chips for each color.

  In addition, a time-division full-color projection display apparatus using one liquid crystal display panel and the lighting device 100B can be configured. For example, in a state where a red video signal is supplied to the one liquid crystal display panel, the LED chip for red light of the first light source 102A is pulse-lit (at this time, the π cell 105 is OFF, for example) Further, the LED chip for red light of the second light source 102B is pulse-lit (at this time, the π cell 105 is ON, for example). Next, the green light LED chip of the first light source 102A is pulse-lit while the green video signal is supplied to the one liquid crystal display panel (at this time, the π cell 105 is OFF, for example). Further, the LED chip for green light of the second light source 102B is pulse-lit (at this time, the π cell 105 is ON, for example). Next, the blue light LED chip of the first light source 102A is pulse-lit while the blue video signal is supplied to the one liquid crystal display panel (at this time, the π cell 105 is OFF, for example). Furthermore, the LED chip for blue light of the second light source 102B is pulse-lit (at this time, the π cell 105 is ON, for example). That is, when a video signal for each color is supplied to the liquid crystal display panel, the LED chip of the color corresponding to the color is sequentially turned on by the two light sources, and the π cell 105 is switched according to the lighting timing. . In this case, the switching polarization rotation element (π cell) is preferably one that can be switched at a high frequency.

  Further, as shown in FIG. 11, the light source 102 used in the illumination device described above includes a tapered rod integrator 108 (the size of the light exit surface is larger than the size of the light incident surface). Also good. The shape and size of the light entrance surface of the rod integrator 108 substantially match the shape and size of the light exit surface of the light source 102, and the shape and size of the light exit surface correspond to the shape and size of the light entrance surface of the polarization converter 103. It almost matches the size.

  Each lighting device may include an integrator lens including a first fly-eye lens and a second fly-eye lens instead of the rod integrator 104. The first fly-eye lenses are respectively disposed on the light exit side of the polarization conversion device 103. The second fly's eye lens is disposed on the light emitting side of the polarization beam combining element 101. The second fly-eye lens is shared by a plurality of light sources. Each pair of lenses in the first fly-eye lens and the second fly-eye lens guides the light emitted from each light source to the entire surface of the image display element.

It is explanatory drawing which showed the illuminating device of embodiment of this invention. It is a front view of the light source used for the illuminating device of FIG. It is a side view of the light source and polarization conversion device which were used for the illuminating device of FIG. It is explanatory drawing which showed the pulse light emission timing of the two light sources in the illuminating device of FIG. It is explanatory drawing which showed the projection type video display apparatus using the illuminating device of FIG. It is explanatory drawing which showed the illuminating device which has (pi) cell, and the projection type video display apparatus using the same. It is explanatory drawing which showed the pulse light emission timing of two light sources in the illuminating device of FIG. 6, and the switch timing of (pi) cell. It is explanatory drawing which showed the projection type video display apparatus using the illuminating device of FIG. It is explanatory drawing which showed the general normally white type liquid crystal display panel. It is explanatory drawing which showed the projection type video display apparatus using the illuminating device of FIG. It is explanatory drawing which showed the other example of the light source.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Illumination device 101 Polarization composition element 102 Light source 103 Polarization conversion device 104 Rod integrator 105 π cell 121 π cell SW circuit 122 LCD driver 123 LED lighting circuit 124 Control circuit

Claims (22)

A plurality of light sources composed of one or a plurality of solid state light emitting elements and arranged in different directions, lighting control means for causing the solid state light emitting elements to emit light, and a first light source of the plurality of light sources. A first polarization conversion device that converts the obtained light into polarized light in a first direction, and a second light that is emitted from a second light source different from the first light source into polarized light in a second direction orthogonal to the first direction. A two-polarization conversion device, and the light emitted from the first light source and polarized in the first direction is guided to a specific optical path by one of the functions of transmission and reflection and is emitted from the second light source to the second direction And an optical path changing means for guiding the polarized light to the specific optical path by the other function. 2. The illumination device according to claim 1, wherein the first light source and the second light source are configured so that light amounts of polarized light in a first direction and polarized light in a second direction obtained through the optical path changing unit are equal. The illuminating device characterized in that the amount of emitted light is different from each other. 3. The illumination device according to claim 1, wherein the first fly-eye lens provided on the light emission side of each light source and the first fly-eye lens provided on the specific optical path are paired with each other. And a second fly-eye lens that integrates and guides light to the object to be illuminated. The illuminating device according to claim 1, further comprising a cylindrical or rod-shaped light integrator on the specific optical path. In the illumination device according to any one of claims 1 to 4, a switching polarization rotating element that switches between a functional state that rotates the polarization direction of received light by 90 degrees and a functional state that does not rotate by turning ON / OFF energization; A switching circuit for controlling the switching polarization rotation element, wherein the switching polarization rotation element is disposed on the specific optical path, and the lighting control means shifts the pulse emission timings of the first light source and the second light source. Lighting control is performed, and the switching circuit turns ON / OFF the switching polarization rotating element in synchronization with the pulse emission timing of the solid state light emitting element, and unifies the polarization direction of the light obtained through the switching polarization rotating element. A lighting device. 5. The illumination device according to claim 1, wherein each light source emits light of the same color. 6. 5. The illumination device according to claim 1, wherein each light source emits white light or each color light that becomes white. 6. It comprises a plurality of illumination devices that emit different color lights, and at least one of the illumination devices is the illumination device according to claim 6, wherein each color light from each illumination device is light-modulated by a display panel, and each color A projection-type image display device configured to synthesize and project modulated light. A plurality of illuminating devices that emit different colored lights, wherein at least one of the illuminating devices is the illuminating device according to claim 6, and each color light from each illuminating device is guided in the same direction to form a single display panel. A projection-type image display apparatus configured to perform light modulation on and project the modulated light. The illumination device according to claim 7 is provided, wherein the white light from the illumination device or each color light that becomes white light is modulated by a single display panel, and the modulated light is projected. Projection-type image display device. The illumination device according to claim 7, wherein the white light from the illumination device is separated into different color lights, each color light is modulated by a display panel, and each color modulated light is combined and projected. Projection-type image display device characterized by that. 12. The projection display apparatus according to claim 8, further comprising: a liquid crystal display panel having no incident-side polarizing plate as the display panel, and a panel driving circuit for driving the liquid crystal display panel. The lighting control means performs lighting control so as to shift the pulse light emission timings of the first light source and the second light source, and the panel driving circuit is configured such that when polarized light in the first direction is incident on the liquid crystal display panel, Generated for a liquid crystal display panel in which the polarization direction on the incident side crosses the polarizing plate on the output side, or for a liquid crystal display panel in which the polarization direction on the incident side is parallel to the polarizing plate on the output side While one of the video signals is supplied to the liquid crystal display panel, when the polarized light in the second direction is incident on the liquid crystal display panel, the other video signal is supplied. Projection display apparatus and supplying to the liquid crystal display panel items. 6. The illuminating device according to claim 5, wherein each light source emits the same color of light. 6. The illuminating device according to claim 5, wherein each light source emits white light or each color light that becomes white light. A plurality of illumination devices that emit different color lights are provided, and at least one of the illumination devices is the illumination device according to claim 13, wherein each color light from each illumination device is modulated by a display panel, and A projection-type image display device configured to synthesize and project modulated light. A plurality of illuminating devices that emit different color lights, wherein at least one of the illuminating devices is the illuminating device according to claim 13, wherein each color light from each illuminating device is guided in the same direction to form a single display panel. A projection-type image display apparatus configured to perform light modulation on and project the modulated light. The illumination device according to claim 14 is provided, wherein white light or white light from the illumination device is modulated by a single display panel, and the modulated light is projected. Projection-type image display device. 15. A lighting device according to claim 14, wherein white light from the lighting device is separated into different color lights, each color light is modulated by a display panel, and each color modulated light is combined and projected. Projection-type image display device characterized by that. 19. The projection display apparatus according to claim 13, further comprising a liquid crystal display panel as the display panel. The projection display apparatus according to any one of claims 8 to 12 or claim 15 to claim 19, wherein the projection display apparatus supplies the display panel with light polarized in the first direction. A projection type video display apparatus, wherein a level of a video signal and a level of a video signal supplied to the display panel when receiving light polarized in the second direction are different from each other. The illuminating device according to any one of claims 1 to 7, or the illuminating device according to any one of claims 13 to 14, wherein the optical path changing means is a glass cube type polarization beam splitter. The projection display apparatus according to any one of claims 8 to 12, or the projection display apparatus according to any one of claims 15 to 20, wherein the optical path changing means is a glass cube type polarization beam splitter. .

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