JP2010175675A - Projection image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection image display apparatus efficiently suppressing heat load on an optical element provided on an optical path of color component light when using color component light of four or more colors. <P>SOLUTION: The projection image display apparatus 100 includes a liquid crystal panel 50R, a liquid crystal panel 50G, a liquid crystal panel 50B, a cross dichroic prism 60, and a polarization state adjusting element 51Ye. Green component light G is made incident on the liquid crystal panel 50G together with yellow component light Ye. The projection image display apparatus 100 includes a first blower 310 and a second blower 320 sending air to an incident-side polarizing plate 52G (or an incident-side pre-polarizing plate 52GP) and an emitting-side polarizing plate 53G, and a cooling capability controller 240 controlling cooling capability of the first and second blowers 310 and 320. The cooling capability controller 240 controls the cooling capability of the first and second blowers 310 and 320 based on quantity of the yellow component light Ye intercepted by the incident-side polarizing plate 52G. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection display apparatus that uses four or more color component lights.

  Conventionally, three light modulation elements corresponding to light components of three colors, a cross dichroic cube that combines light emitted from the three light modulation elements, and a projection optical system that projects light synthesized by the cross dichroic cube There is known a projection display apparatus having

  In such a projection display apparatus, an optical element (for example, a polarizing plate) provided on the optical path of the color component light generates heat when irradiated with the color component light. Therefore, the projection display apparatus generally has a cooling unit for cooling the optical element.

  On the other hand, for the purpose of improving color reproducibility and brightness, a projection display apparatus using four or more color component lights has been proposed. For example, a projection display apparatus improves color reproducibility and luminance by using orange component light, yellow component light, or cyan component light in addition to red component light, green component light, and blue component light. (For example, patent literature).

JP 2002-287247 A

  Here, in a projection display apparatus that uses four or more color component lights and emits light from three light modulation elements, an optical element (for example, a polarizing plate) provided on the optical path of the color component light The heat load on is increased. Therefore, a new framework for cooling the optical element is required.

  Therefore, the present invention has been made to solve the above-described problems. When four or more color component lights are used, the thermal load applied to the optical element provided on the optical path of the color component lights is reduced. It is an object of the present invention to provide a projection display apparatus that can be efficiently suppressed.

  The projection display apparatus according to the first feature includes a red light modulation element (liquid crystal panel 50R) that modulates red component light, a green light modulation element (liquid crystal panel 50G) that modulates green component light, and blue component light. A blue light modulating element (liquid crystal panel 50B) to be modulated, a color combining unit (cross dichroic prism 60) for combining light emitted from the red light modulating element, the green light modulating element and the blue light modulating element; A polarization state adjustment element (polarization state adjustment element 51Ye) for adjusting the polarization state of the color component light. Of the red component light, the green component light, and the blue component light, superimposition component light (for example, green component light G), which is any color component light, together with the fourth color component light, is the polarization state adjusting element. Is incident on. The projection display apparatus includes a first blower unit (first unit) that sends wind to a first polarizing plate (for example, the incident-side polarizing plate 52G or the incident-side pre-polarizing plate 52GP) provided on the light emitting side of the polarization state adjusting element. 1 air blower 310) and a second air blower (second air blower) that sends wind to the second polarizing plate (for example, the light emitting side polarizing plate 53G) provided on the light emission side of the specific light modulation element corresponding to the superimposed component light. And a control unit (cooling capacity control unit 240) for controlling the cooling capacity of the first and second blowing units. The control unit controls the cooling capacity of the first air blowing unit based on the light amount of the fourth color component light shielded by the first polarizing plate.

  1st characteristic WHEREIN: The said control part controls the cooling capability of a said 2nd ventilation part based on the light quantity of the said superimposition component light light-shielded by the said 2nd polarizing plate.

  The projection display apparatus according to the second feature includes a red light modulation element (liquid crystal panel 50R) that modulates red component light, a green light modulation element (liquid crystal panel 50G) that modulates green component light, and blue component light. A blue light modulating element (liquid crystal panel 50B) to be modulated, a color combining unit (cross dichroic prism 60) for combining light emitted from the red light modulating element, the green light modulating element and the blue light modulating element; A polarization state adjustment element (polarization state adjustment element 51Ye) for adjusting the polarization state of the color component light. Of the red component light, the green component light, and the blue component light, superimposition component light (for example, green component light G), which is any color component light, together with the fourth color component light, is the polarization state adjusting element. Is incident on. The projection display apparatus includes a first polarizing plate (for example, an incident-side polarizing plate 52G or an incident-side pre-polarizing plate 52GP) provided on the light exit side of the polarization state adjusting element and specific light corresponding to the superimposed component light. A blower unit (blower unit 300) for sending air to a second polarizing plate (for example, emission side polarizing plate 53G) provided on the light emitting side of the modulation element, and a control unit (cooling capability) for controlling the cooling capability of the blowing unit A control unit 240). The air blowing section has a movable damper (movable damper 301) that changes the direction of the air sent out from the air blowing section. The control unit controls the position of the movable damper based on the amount of the superimposed component light shielded by the second polarizing plate.

  2nd characteristic WHEREIN: The said control part controls the position of the said movable damper based on the light quantity of the said 4th color component light light-shielded by the said 1st polarizing plate.

  In the first feature and the second feature, the specific light modulation element is a light modulation panel that modulates the superimposed component light. The first polarizing plate is an incident side polarizing plate provided on the light incident side of the light modulation panel. The second polarizing plate is an output side polarizing plate provided on the light output side of the light modulation panel.

  According to the present invention, when four or more color component lights are used, a projection-type image display that can efficiently suppress the thermal load on the optical element provided on the optical path of the color component light. An apparatus can be provided.

1 is a diagram showing a projection display apparatus 100 according to a first embodiment. It is a figure which shows the vicinity of the polarization state adjustment element 51Ye which concerns on 1st Embodiment. It is a figure which shows the vicinity of the polarization state adjustment element 51Ye which concerns on 1st Embodiment. It is a figure which shows the structure of the ventilation part which concerns on 1st Embodiment. It is a figure which shows the structure of the ventilation part which concerns on 1st Embodiment. It is a block diagram which shows the control unit 200 which concerns on 1st Embodiment. It is a figure for demonstrating control of the ventilation part which concerns on 1st Embodiment. It is a figure for demonstrating control of the ventilation part which concerns on 1st Embodiment. It is a figure which shows the structure of the ventilation part which concerns on the example 1 of a change. It is a figure which shows the structure of the ventilation part which concerns on the example 1 of a change. It is a figure for demonstrating control of the ventilation part which concerns on the example 1 of a change.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
A projection display apparatus according to an embodiment includes a red light modulation element that modulates red component light, a green light modulation element that modulates green component light, a blue light modulation element that modulates blue component light, and a red light modulation element A color combining unit that combines light emitted from the green light modulation element and the blue light modulation element, and a polarization state adjustment element that adjusts the polarization state of the fourth color component light. Of the red component light, the green component light, and the blue component light, the superimposed component light that is one of the color component lights enters the polarization state adjusting element together with the fourth color component light. The projection display apparatus includes a first polarizing plate (for example, an incident-side polarizing plate 52G or an incident-side pre-polarizing plate 52GP) provided on the light exit side of the polarization state adjusting element and a specific light modulation element corresponding to superimposed component light. A blowing unit (the blowing unit 300 or the first blowing unit 310 and the second blowing unit 320) for sending wind to a second polarizing plate (for example, the emitting side polarizing plate 53G) provided on the light emitting side, and a blowing unit And a control unit (cooling capacity control unit 240) for controlling the cooling capacity. The control unit controls the cooling capacity of the blowing unit based on the amount of the fourth color component light shielded by the first polarizing plate.

  According to the embodiment, the control unit controls the cooling capacity of the air blowing unit that sends air to the first polarizing plate and the second polarizing plate based on the light amount of the fourth color component light shielded by the first polarizing plate. .

  Therefore, even if the fourth color component light is incident on the first polarizing plate provided on the light emitting side of the polarization adjusting element, in addition to the superimposed component light, the deterioration of the first polarizing plate is suppressed. it can.

  That is, even when four or more color component lights are used, the thermal load on the optical element (for example, the first polarizing plate) provided on the optical path of the color component light can be efficiently suppressed. it can.

  In the embodiment, yellow component light is exemplified as the fourth color component light, but the fourth color component light is not limited to this. The fourth color component light may be magenta component light or cyan component light.

  In the embodiment, green component light is exemplified as the superimposed component light, but the superimposed component light is not limited to this. The superimposed component light may be red component light or blue component light.

[Configuration of the embodiment]
In the following, the embodiments will be described in the order of (1) the first embodiment and (2) the first modification.

  (1) About 1st Embodiment, referring to FIGS. 1-8, (a) The structure of a projection type video display apparatus, (b) The structure of a polarization state adjustment element, (c) The structure of a ventilation part, d) Functions of the projection display apparatus, (e) actions and effects will be described in this order.

  (2) About the example 1 of a change, it demonstrates in order of (a) structure of a ventilation part, (b) effect | action, and an effect, referring FIGS. 9-11.

[First Embodiment]
(Configuration of projection display device)
Hereinafter, the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 100 includes a projection optical system 110 and an illumination device 120. As will be described later, the projection display apparatus 100 uses yellow component light Ye in addition to red component light R, green component light G, and blue component light B.

  The projection optical system 110 projects the image light emitted from the illumination device 120 onto a screen (not shown).

  First, the illumination device 120 includes a light source 10, a UV / IR cut filter 20, a fly-eye lens unit 30, a PBS array 40, and a plurality of liquid crystal panels 50 (a liquid crystal panel 50R, a liquid crystal panel 50G, and a liquid crystal panel 50B). ), A polarization state adjusting element 51Ye, and a cross dichroic prism 60.

  The light source 10 is a light source that emits white light (for example, a UHP lamp or a xenon lamp). That is, the light emitted from the light source 10 includes yellow component light Ye in addition to red component light R, green component light G, and blue component light B.

  The UV / IR cut filter 20 transmits visible light components (red component light R, green component light G, and blue component light B). The UV / IR cut filter 20 reflects an infrared light component and an ultraviolet light component.

  The fly-eye lens unit 30 makes the light emitted from the light source 10 uniform. Specifically, the fly eye lens unit 30 includes a fly eye lens 31 and a fly eye lens 32. The fly-eye lens 31 and the fly-eye lens 32 are each composed of a plurality of minute lenses. Each microlens condenses the light emitted from the light source 10 so that the light emitted from the light source 10 is irradiated on the entire surface of the liquid crystal panel 50.

  The PBS array 40 aligns the polarization state of the light emitted from the fly-eye lens unit 30. For example, the PBS array 40 aligns the light emitted from the fly-eye lens unit 30 with S-polarized light (or P-polarized light).

The liquid crystal panel 50R modulates the red component light R based on a red video signal (a red output signal R _out described later). An incident-side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light is incident on the liquid crystal panel 50R. 52R is provided. On the side from which light is emitted from the liquid crystal panel 50R, the exit-side polarizing plate that blocks light having one polarization direction (for example, S-polarized light) and transmits light having another polarization direction (for example, P-polarized light). 53R is provided.

The liquid crystal panel 50G modulates the green component light G based on a green video signal (a green output signal G _out described later). An incident-side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light enters the liquid crystal panel 50G. 52G is provided. On the other hand, on the side where the light is emitted from the liquid crystal panel 50G, light having one polarization direction (for example, S-polarized light) is shielded and light having another polarization direction (for example, P-polarized light) is transmitted. A side polarizing plate 53G is provided.

The liquid crystal panel 50B modulates the blue component light B based on a blue video signal (a blue output signal B _out described later). An incident side polarizing plate that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the side on which light is incident on the liquid crystal panel 50B. 52B is provided. On the other hand, on the side from which light is emitted from the liquid crystal panel 50B, light having one polarization direction (for example, S-polarized light) is shielded and light having another polarization direction (for example, P-polarized light) is transmitted. A side polarizing plate 53B is provided.

  Here, each liquid crystal panel 50 may be provided with a compensation plate (not shown) for improving the contrast ratio and the transmittance. Each polarizing plate may have a pre-polarizing plate that reduces the amount of light incident on the polarizing plate and the thermal burden.

  The yellow component light Ye and the green component light G are incident on the polarization adjustment element 51Ye. The green component light G is superposed component light different from the complementary color light (blue component light B) of the yellow component light Ye among the red component light R, the green component light G, and the blue component light B. That is, the polarization state adjusting element 51Ye is provided on the optical path of the green component light G.

  The polarization state adjustment element 51Ye adjusts the polarization state of the yellow component light Ye without adjusting the polarization state of the superimposed component light (here, the green component light G). Specifically, the polarization state adjusting element 51Ye adjusts the polarization state of the yellow component light Ye in accordance with the voltage applied to the element.

  For example, the polarization state adjustment element 51Ye is an optical element configured to be selectively switchable between a state in which the polarization direction of the yellow component light Ye is not rotated and a state in which the polarization direction of the yellow component light Ye is rotated by 90 °. . Alternatively, the polarization state adjusting element 51Ye is an optical element that adjusts the polarization state of the yellow component light Ye within a range of 0 to 90 °.

  Here, the polarization state adjusting element 51Ye may have a single pixel, and the amount of superimposition of the yellow component light Ye may be uniformly controlled by the frame. Moreover, the polarization state adjusting element 51Ye may include a plurality of pixels, and the amount of superimposition of the yellow component light Ye may be controlled for each pixel. The number of pixels of the polarization state adjusting element 51Ye is preferably smaller than the number of pixels of the liquid crystal panel 50.

  The cross dichroic prism 60 constitutes a color combining unit that combines light emitted from the liquid crystal panel 50R, the liquid crystal panel 50G, and the liquid crystal panel 50B. The combined light emitted from the cross dichroic prism 60 is guided to the projection optical system 110.

  2ndly, the illuminating device 120 has a mirror group (mirror 71-mirror 76) and a lens group (lens 81-lens 85).

  The mirror 71 is a dichroic mirror that transmits the blue component light B and reflects the red component light R and the green component light G. The mirror 72 is a dichroic mirror that transmits the red component light R and reflects the green component light G. The mirror 71 and the mirror 72 constitute a color separation unit that separates the red component light R, the green component light G, and the blue component light B.

  The mirror 73 reflects the red component light R, the green component light G, and the blue component light B, and guides the red component light R, the green component light G, and the blue component light B to the mirror 71 side. The mirror 74 reflects the blue component light B and guides the blue component light B to the liquid crystal panel 50B side. The mirror 75 and the mirror 76 reflect the red component light R and guide the red component light R to the liquid crystal panel 50R side.

  The lens 81 is a condenser lens that collects the light emitted from the PBS array 40. The lens 82 is a condenser lens that collects the light reflected by the mirror 73.

  The lens 83R collimates the red component light R so that the liquid crystal panel 50R is irradiated with the red component light R. The lens 83G collimates the green component light G so that the liquid crystal panel 50G is irradiated with the green component light G. The lens 83B collimates the blue component light B so that the liquid crystal panel 50B is irradiated with the blue component light B.

  The lens 84 and the lens 85 are relay lenses that substantially image the red component light R on the liquid crystal panel 50R while suppressing the expansion of the red component light R.

(Configuration of polarization adjustment element)
Hereinafter, the configuration of the polarization state adjusting element according to the first embodiment will be described with reference to the drawings. 2 and 3 are diagrams showing the vicinity of the polarization state adjusting element 51Ye according to the first embodiment.

  As shown in FIG. 2, the polarization state adjusting element 51Ye transmits the yellow component light Ye without adjusting the polarization state in the Ye-ON state. That is, the polarization state of the yellow component light Ye is the same as the polarization state of the green component light G on the light emission side of the polarization state adjusting element 51Ye. The Ye-ON state is a state in which yellow component light Ye is used.

  As shown in FIG. 3, the polarization state adjusting element 51Ye transmits the yellow component light Ye while adjusting the polarization state in the Ye-OFF state. That is, the polarization state of the yellow component light Ye is different from the polarization state of the green component light G on the light emission side of the polarization state adjusting element 51Ye. The Ye-OFF state is a state in which the yellow component light Ye is not used. In the Ye-OFF state, the yellow component light Ye is shielded by the incident-side polarizing plate 52G provided on the light incident side of the liquid crystal panel 50G.

(Structure of the air blower)
Below, the structure of the ventilation part which concerns on 1st Embodiment is demonstrated, referring drawings. 4 and 5 are diagrams illustrating an example of the air blowing units (the first air blowing unit 310 and the second air blowing unit 320) according to the first embodiment. 4 and 5 are diagrams showing the periphery of the mirror 71, the polarization state adjusting element 51Ye, the liquid crystal panel 50G, and the cross dichroic prism 60. FIG. Note that in FIG. 1 described above, the first blower 310 and the second blower 320 are merely omitted.

  First, the first configuration of the first blower 310 and the second blower 320 will be described with reference to FIG.

  As shown in FIG. 4, an incident-side polarizing plate 52G is provided on the light incident side of the liquid crystal panel 50G, that is, on the light emitting side of the polarization state adjusting element 51Ye. On the other hand, an exit-side polarizing plate 53G is provided on the light exit side of the liquid crystal panel 50G.

  Here, the 1st ventilation part 310 is a 1st ventilation part which sends an air to the incident side polarizing plate 52G provided in the light incident side of the liquid crystal panel 50G, ie, the light emission side of the polarization state adjustment element 51Ye.

The cooling capacity of the first blower 310 is controlled based on the amount of yellow component light Ye that is shielded by the incident-side polarizing plate 52G, as will be described later. That is, the cooling capacity of the first blower 310 is controlled based on the yellow output signal Ye _out .

  In addition, since heat generated by shielding the yellow component light Ye with the incident side polarizing plate 52G is transmitted to the polarization state adjusting element 51Ye, the first air blowing unit 310 causes the wind to the polarization state adjusting element 51Ye and the incident side polarizing plate 52G. Send. That is, the 1st ventilation part 310 cools the polarization state adjustment element 51Ye and the incident side polarizing plate 52G.

  The second air blowing unit 320 sends wind to the emission side polarizing plate 53G provided on the light emission side of the specific light modulation element (here, the liquid crystal panel 50G) corresponding to the superimposed component light (here, the green component light G). It is the 2nd ventilation part to send.

As will be described later, the cooling capacity of the second blower 320 is controlled based on the green component light G that is shielded by the output-side polarizing plate 53G. That is, the cooling capacity of the second blower 320 is controlled based on the green output signal _Gout .

  In addition, since heat generated by shielding the green component light G (and yellow component light Ye) by the emission side polarizing plate 53G is transmitted to the liquid crystal panel 50G, the second air blowing unit 320 includes the liquid crystal panel 50G and the emission side polarization. The wind is sent to the board 53G. That is, the 2nd ventilation part 320 cools the liquid crystal panel 50G and the output side polarizing plate 53G.

  2ndly, the 2nd structure of the 1st ventilation part 310 and the 2nd ventilation part 320 is demonstrated, referring FIG.

  As shown in FIG. 5, an incident-side polarizing plate 52G is provided on the light incident side of the liquid crystal panel 50G. On the light incident side of the incident side polarizing plate 52G, that is, on the light emitting side of the polarization state adjusting element 51Ye, an incident side pre-polarizing plate 52GP is provided. On the other hand, an exit-side polarizing plate 53G is provided on the light exit side of the liquid crystal panel 50G.

  Here, the 1st ventilation part 310 is a 1st ventilation part which sends a wind to the incident side pre-polarizing plate 52GP provided in the light-projection side of the polarization state adjustment element 51Ye.

The cooling capacity of the first blower 310 is controlled based on the amount of yellow component light Ye shielded by the incident-side pre-polarizing plate 52GP, as in the first configuration. That is, the cooling capacity of the first blower 310 is controlled based on the yellow output signal Ye _out .

  In addition, since heat generated by shielding the yellow component light Ye with the incident-side pre-polarizer 52GP is transmitted to the polarization state adjusting element 51Ye, the first blower 310 transmits the polarization state adjusting element 51Ye and the incident-side polarizing plate 52G. Send the wind. That is, the 1st ventilation part 310 cools the polarization state adjustment element 51Ye and the incident side pre-polarizing plate 52GP.

  The second air blowing unit 320 sends wind to the emission side polarizing plate 53G provided on the light emission side of the specific light modulation element (here, the liquid crystal panel 50G) corresponding to the superimposed component light (here, the green component light G). It is the 2nd ventilation part to send.

The cooling capacity of the second blower 320 is controlled based on the green component light G that is shielded by the emission-side polarizing plate 53G, as in the first configuration. That is, the cooling capacity of the second blower 320 is controlled based on the green output signal _Gout .

  In addition, since heat generated by shielding the green component light G (and yellow component light Ye) by the emission side polarizing plate 53G is transmitted to the liquid crystal panel 50G, the second air blowing unit 320 includes the liquid crystal panel 50G and the emission side polarization. The wind is sent to the board 53G. That is, the 2nd ventilation part 320 cools the liquid crystal panel 50G and the output side polarizing plate 53G.

  In FIG. 5, since the incident side pre-polarizing plate 52GP is provided on the light incident side of the incident side polarizing plate 52G, it should be noted that the necessity of cooling the incident side polarizing plate 52G is low.

(Function of projection display device)
Hereinafter, functions of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 6 is a block diagram showing the control unit 200 provided in the projection display apparatus 100 according to the first embodiment.

Here, the control unit 200 converts the video input signal into a video output signal and outputs the video output signal. The video input signal is a signal for each frame and includes a red input signal R _in , a green input signal G _in and a blue input signal B _in . The video output signal is a signal for each frame, and includes a red output signal _Rout , a green output signal _Gout, and a blue output signal _Bout .

  As shown in FIG. 6, the control unit 200 includes a video signal receiving unit 210, a Ye overlap amount calculation unit 220, an RGB correction unit 230, and a cooling capacity control unit 240.

  The video signal receiving unit 210 receives a video input signal from an external device such as a DVD or a TV tuner.

The Ye superposition amount calculation unit 220 calculates the superposition amount of the yellow component light Ye based on the video input signals (red input signal R _in , green input signal G _in and blue input signal B _in ). The Ye overlap amount calculation unit 220 outputs a signal (yellow output signal Ye _out ) corresponding to the overlap amount of the yellow component light Ye to the polarization state adjustment element 51Ye in order to adjust the polarization state of the yellow component light Ye.

  For example, the Ye superposition amount calculation unit 220 calculates the superposition amount of the yellow component light Ye based on the saturation and luminance of a frame configured by a plurality of pixels. For example, the Ye superposition amount calculation unit 220 increases the superposition amount of the yellow component light Ye as the saturation of the frame is lower. Further, the Ye superposition amount calculation unit 220 increases the superposition amount of the yellow component light Ye as the luminance of the frame is higher.

The RGB correction unit 230 generates a video output signal (a red output signal R _out , a green output signal G _out, and a blue output based on a video input signal (a red input signal R _in , a green input signal G _in, and a blue input signal B _in )). Signal B _out ) is calculated. Specifically, RGB correction unit 230, based on the yellow output signals _{Ye out,} to correct the red output signal _{R out,} a green output signal _{G out,} and _the blue output signal _{B out.}

For example, the RGB correction unit 230 calculates a red output signal R _out and a green output signal G _out by subtracting a predetermined value from the red input signal R _in and the green input signal G _in based on the yellow output signal Ye _out. . Alternatively, the RGB correction unit 230 calculates a blue output signal B _out by adding a predetermined value to the blue input signal B _in based on the yellow output signal Ye _out . By the subtraction process of the red input signal R _in and the green input signal G _in and the addition process of the blue input signal B _in , “color shift” caused by the superimposition of the yellow component light Ye is suppressed.

  The cooling capacity control unit 240 controls the cooling capacity of the first air blowing unit 310 and the cooling capacity of the second air blowing unit 320. Here, the first configuration shown in FIG. 4 will be described as an example, but the present invention can of course be applied to the second configuration shown in FIG.

1stly, the cooling capacity control part 240 controls the cooling capacity of the 1st ventilation part 310 based on the light quantity of the yellow component light Ye shielded with the incident side polarizing plate 52G. In other words, the cooling capacity control unit 240 controls the cooling capacity of the first air blowing unit 310 based on the superposition amount of the yellow component light Ye (that is, the yellow output signal Ye _out ). It should be noted that the smaller the amount of yellow component light Ye superimposed (that is, the yellow output signal Ye _out ), the greater the amount of yellow component light Ye that is shielded by the incident-side polarizing plate 52G.

For example, the cooling capacity control unit 240 controls the cooling capacity of the first air blowing unit 310 according to the relationship shown in FIG. That is, the cooling capacity control unit 240 increases the cooling capacity of the first blower unit 310 as the yellow output signal Ye _out is smaller. The cooling capacity control section 240, when the yellow output signal _{Ye out} is greater than the threshold Th ₁ can be kept the cooling capacity of the first blower unit 310 constant.

Secondly, the cooling capacity control unit 240 controls the cooling capacity of the second air blowing unit 320 based on the green component light G shielded by the emission side polarizing plate 53G. In other words, the cooling capacity control unit 240 controls the cooling capacity of the second air blowing unit 320 based on the green output signal _Gout . It should be noted that the smaller the green output signal _{Gout, the} greater the amount of green component light G that is shielded by the exit-side polarizing plate 53G. Also, it should be noted that when the green output signal _Gout is small, the yellow component light Ye superimposed on the green component light G is also shielded by the emission side polarizing plate 53G.

For example, the cooling capacity control unit 240 controls the cooling capacity of the second air blowing unit 320 in the relationship shown in FIG. That is, the cooling capacity control unit 240 increases the cooling capacity of the second air blowing unit 320 as the green output signal _Gout is smaller. The cooling capacity control section 240, when the green output signal _{G out} is larger than the threshold Th ₂ may maintain the cooling capacity of the first blower unit 310 constant.

(Function and effect)
In the first embodiment, the cooling capacity control unit 240 is based on the amount of yellow component light Ye that is blocked by the incident-side polarizing plate 52G (or the incident-side pre-polarizing plate 52GP) (that is, the yellow output signal Ye _out ). The cooling capacity of the first blower 310 that sends wind to the incident-side polarizing plate 52G (or the incident-side pre-polarizing plate 52GP) is controlled.

Specifically, the cooling capacity control unit 240 increases the amount of yellow component light Ye shielded by the incident side polarizing plate 52G (or the incident side pre-polarizing plate 52GP), that is, the yellow output signal Ye _out is smaller. As a result, the cooling capacity of the first blower 310 is increased. In addition, the cooling capacity control unit 240 increases the amount of yellow component light Ye shielded by the incident-side polarizing plate 52G (or the incident-side pre-polarizing plate 52GP), that is, as the yellow output signal Ye _out increases. 1 The cooling capacity of the air blowing unit 310 is weakened.

  Therefore, in addition to the superimposed component light (here, the green component light G), yellow is added to the incident side polarizing plate 52G (or the incident side pre-polarizing plate 52GP) provided on the light exit side of the polarization state adjusting element 51Ye. Even if the component light Ye is incident, the deterioration of the incident-side polarizing plate 52G can be suppressed. At the same time, power saving can be achieved.

In the first embodiment, the cooling capacity control unit 240 sends wind to the output-side polarizing plate 53G based on the light amount of the green component light G that is blocked by the output-side polarizing plate 53G (that is, the green output signal G _out ). The cooling capacity of the second blower 320 is controlled.

Specifically, the cooling capacity control unit 240 increases the cooling capacity of the second blowing unit 320 as the amount of the green component light G shielded by the emission-side polarizing plate 53G increases, that is, as the green output signal _{Gout decreases.} Make it stronger. In addition, the cooling capacity control unit 240 weakens the cooling capacity of the second air blowing unit 320 as the light amount of the green component light G to be shielded by is small, that is, as the green output signal G _out is large.

  Therefore, it is possible to suppress the deterioration of the emission side polarizing plate 53G provided on the light emission side of the liquid crystal panel 50G. At the same time, power saving can be achieved.

  As described above, even when the yellow component light Ye is used in addition to the red component light R, the green component light G, and the blue component light B, the liquid crystal panel 50G and the incident side polarizing plate 52G (or the incident side pre-light) are used. The deterioration of the polarizing plate 52GP) and the output side polarizing plate 53G can be efficiently suppressed.

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described.

  Specifically, in the first embodiment, a plurality of air blowing units (the first air blowing unit 310 and the second air blowing unit 320) are provided as the air blowing units. On the other hand, in the first modification, a single air blowing unit is provided as the air blowing unit.

(Structure of the air blower)
Below, the structure of the ventilation part which concerns on the modification 1 is demonstrated, referring drawings. 9 and 10 are diagrams illustrating an example of the air blowing unit 300 according to the first modification. 9 and 10 are views showing the periphery of the mirror 71, the polarization state adjusting element 51Ye, the liquid crystal panel 50G, and the cross dichroic prism 60. FIG.

  First, the first configuration of the air blowing unit 300 will be described with reference to FIG.

  As shown in FIG. 9, an incident side polarizing plate 52G is provided on the light incident side of the liquid crystal panel 50G, that is, on the light emitting side of the polarization state adjusting element 51Ye. On the other hand, an exit-side polarizing plate 53G is provided on the light exit side of the liquid crystal panel 50G.

  Here, the air blowing unit 300 includes a movable damper 301 that changes the direction of the air sent out from the air blowing unit 300.

  When the position of the movable damper 301 is the position X, the wind sent from the blower unit 300 is incident side polarizing plate provided on the light incident side of the liquid crystal panel 50G, that is, the light emitting side of the polarization state adjusting element 51Ye. To 52G.

  When the position of the movable damper 301 is the position Y, the wind sent from the blower 300 is a specific light modulation element (here, the liquid crystal panel 50G) corresponding to the superimposed component light (here, the green component light G). Is sent to an exit-side polarizing plate 53G provided on the light exit side.

The position of the movable damper 301 is controlled based on the amount of yellow component light Ye shielded by the incident-side polarizing plate 52G. In other words, the position of the movable damper 301 is controlled based on the superposition amount of the yellow component light Ye (yellow output signal Ye _out ). Specifically, the position of the movable damper 301 is controlled between the position X and the position Y based on the amount of yellow component light Ye shielded by the incident-side polarizing plate 52G.

  When the position of the movable damper 301 is the position X, the wind sent from the blower unit 300 is guided to the incident side polarizing plate 52G rather than the output side polarizing plate 53G. Further, since the wind speed guided to the incident side polarizing plate 52G is increased, the ability to cool the incident side polarizing plate 52G is increased.

  When the position of the movable damper 301 is the position Y, the wind sent from the blower unit 300 is guided to the output side polarizing plate 53G rather than the incident side polarizing plate 52G. Moreover, since the wind speed guided to the output side polarizing plate 53G increases, the ability to cool the output side polarizing plate 53G increases.

  Secondly, a second configuration of the first blower 310 and the second blower 320 will be described with reference to FIG.

  As shown in FIG. 10, an incident-side polarizing plate 52G is provided on the light incident side of the liquid crystal panel 50G. On the light incident side of the incident side polarizing plate 52G, that is, on the light emitting side of the polarization state adjusting element 51Ye, an incident side pre-polarizing plate 52GP is provided. On the other hand, an exit-side polarizing plate 53G is provided on the light exit side of the liquid crystal panel 50G.

  Here, the air blowing unit 300 includes a movable damper 301 that changes the direction of the air sent from the air blowing unit 300, as in the first configuration.

  When the position of the movable damper 301 is the position X, the wind sent from the blower unit 300 is sent to the incident side pre-polarizing plate 52GP provided on the light emitting side of the polarization state adjusting element 51Ye.

  When the position of the movable damper 301 is the position Y, the wind sent from the blower 300 is a specific light modulation element (here, the liquid crystal panel 50G) corresponding to the superimposed component light (here, the green component light G). Is sent to an exit-side polarizing plate 53G provided on the light exit side.

The position of the movable damper 301 is controlled based on the amount of yellow component light Ye shielded by the incident-side pre-polarizing plate 52GP, as in the first configuration. In other words, the position of the movable damper 301 is controlled based on the superposition amount of the yellow component light Ye (yellow output signal Ye _out ). Specifically, the position of the movable damper 301 is controlled between the position X and the position Y based on the amount of yellow component light Ye shielded by the incident-side pre-polarizing plate 52GP.

  When the position of the movable damper 301 is the position X, the wind sent from the blower 300 is guided to the incident side pre-polarizing plate 52GP rather than the emission side polarizing plate 53G. Further, since the wind speed guided to the incident-side pre-polarizing plate 52GP is increased, the ability to cool the incident-side pre-polarizing plate 52GP is increased.

  When the position of the movable damper 301 is the position Y, the wind sent from the blower unit 300 is guided to the output side polarizing plate 53G rather than the incident side pre-polarizing plate 52GP. Moreover, since the wind speed guided to the output side polarizing plate 53G increases, the ability to cool the output side polarizing plate 53G increases.

(Function of projection display device)
Hereinafter, functions of the projection display apparatus according to the first modification will be described. It should be noted that the configuration of the control unit 200 according to the first modification is the same as the configuration illustrated in FIG.

  The cooling capacity control unit 240 controls the position of the movable damper 301. Here, the first configuration shown in FIG. 9 will be described as an example, but it is needless to say that the first configuration shown in FIG. 10 can also be applied.

Specifically, the cooling capacity control unit 240 controls the position of the movable damper 301 based on the amount of yellow component light Ye shielded by the incident side polarizing plate 52G. In other words, the cooling capacity control unit 240 controls the position of the movable damper 301 based on the amount of yellow component light Ye superimposed (yellow output signal Ye _out ).

  For example, in the position control of the movable damper 301, the cooling capacity control unit 240 refers to the information shown in FIG. In FIG. 11, case (1) to case (4) are shown.

Case (1) is a case where the green output signal G _out is large and the yellow output signal Ye _out is large. In such a case, the light amount (light shielding amount) of the yellow component light Ye shielded by the incident side polarizing plate 52G is small, and the thermal load of the output side polarizing plate 53G is in the cases (1) to (4). 3rd largest.

Specifically, since the yellow output signal Ye _out is large, the amount of yellow component light Ye superimposed is large. Therefore, the amount of yellow component light Ye shielded by the incident side polarizing plate 52G is small.

On the other hand, in addition to the green component light G, a large amount of yellow component light Ye enters the output-side polarizing plate 53G. However, since the green output signal G _out is large, the green component light G and a large amount of yellow component light Ye are transmitted through the emission-side polarizing plate 53G. Therefore, the thermal load of the output side polarizing plate 53G is the third.

Case (2) is a case where the green output signal G _out is large and the yellow output signal Ye _out is small. In such a case, the amount of light (light shielding amount) of the yellow component light Ye shielded by the incident side polarizing plate 52G is large, and the thermal load of the output side polarizing plate 53G is in the cases (1) to (4). The smallest.

Specifically, since the yellow output signal Ye _out is small, the amount of yellow component light Ye superimposed is small. Therefore, the amount of yellow component light Ye shielded by the incident side polarizing plate 52G is large.

On the other hand, in addition to the green component light G, a small amount of yellow component light Ye enters the output-side polarizing plate 53G. Further, since the green output signal _Gout is large, the green component light G and a small amount of yellow component light Ye are transmitted through the emission side polarizing plate 53G. Therefore, the thermal load on the output side polarizing plate 53G is the smallest.

Case (3) is a case where the green output signal G _out is small and the yellow output signal Ye _out is large. In such a case, the light amount (light shielding amount) of the yellow component light Ye shielded by the incident side polarizing plate 52G is small, and the thermal load of the output side polarizing plate 53G is in the cases (1) to (4). The biggest.

Specifically, since the yellow output signal Ye _out is large, the amount of yellow component light Ye superimposed is large. Therefore, the amount of yellow component light Ye shielded by the incident side polarizing plate 52G is small.

On the other hand, in addition to the green component light G, a large amount of yellow component light Ye enters the output-side polarizing plate 53G. Further, since the green output signal _Gout is small, the green component light G and a large amount of yellow component light Ye are shielded by the emission side polarizing plate 53G. Therefore, the heat load on the output side polarizing plate 53G is the largest.

Case (4) is a case where the green output signal G _out is small and the yellow output signal Ye _out is small. In such a case, the amount of light (light shielding amount) of the yellow component light Ye shielded by the incident side polarizing plate 52G is large, and the thermal load of the output side polarizing plate 53G is in the cases (1) to (4). Second largest.

Specifically, since the yellow output signal Ye _out is small, the amount of yellow component light Ye superimposed is small. Therefore, the amount of yellow component light Ye shielded by the incident side polarizing plate 52G is large.

On the other hand, in addition to the green component light G, a small amount of yellow component light Ye enters the output-side polarizing plate 53G. However, since the green output signal _Gout is small, the green component light G and a small amount of yellow component light Ye are shielded by the output side polarizing plate 53G. Therefore, the heat load on the output side polarizing plate 53G is the second largest.

  In the case (3), the cooling capacity control unit 240 controls the movable damper 301 so that the wind sent out from the blower unit 300 is guided most to the emission side polarizing plate 53G (damper control mode = mode A).

  In the case (4), the cooling capacity control unit 240 controls the movable damper 301 so that the wind sent from the blower unit 300 is guided to the incident side polarizing plate 52G rather than the case (3) (damper control mode = Mode B).

  In the case (1), the cooling capacity control unit 240 controls the movable damper 301 so that the wind sent from the blower unit 300 is guided to the incident side polarizing plate 52G rather than the case (4) (damper control mode = Mode C).

  In the case (2), the cooling capacity control unit 240 controls the movable damper 301 so that the wind sent from the blower unit 300 is guided to the most incident side polarizing plate 52G (damper control mode = mode D).

Thus, the cooling capacity control section 240, in addition to the yellow output signals _{Ye out,} based on the green output signal _{G out,} it is preferable to control the movable damper 301. Specifically, it is preferable that the cooling capacity control unit 240 controls the movable damper 301 based on the thermal load of the emission side polarizing plate 53G.

In the case (3) in which the thermal load on the exit-side polarizing plate 53G is the largest, the amount of yellow component light Ye is reduced in order to reduce the amount of yellow component light Ye blocked by the exit-side polarizing plate 53G. Thus, it is preferable to correct the yellow output signal Ye _out . Thereby, a part of the yellow component light Ye is shielded by the incident side polarizing plate 52G, so that the thermal load on the outgoing side polarizing plate 53G is reduced.

  In the case (3), the yellow component light Ye is finally shielded by the emission side polarizing plate 53G. It should be noted that even if the yellow component light Ye is shielded by the incident side polarizing plate 52G, the influence on the image is small.

Here, in case (3), when the yellow output signal Ye _out is corrected so that the amount of superposition of the yellow component light Ye decreases, it is not always necessary to control the movable damper 301 in the mode A. For example, the movable damper 301 may be controlled in mode A in the case (4), and the movable damper 301 may be controlled in mode B in the case (3).

(Function and effect)
In the first modification, the cooling capacity control unit 240 controls the movable damper 301 based on the yellow output signal Ye _out . Therefore, even when the yellow component light Ye is used in addition to the red component light R, the green component light G, and the blue component light B, the liquid crystal panel 50G, the incident side polarizing plate 52G (or the incident side pre-polarizing plate). 52GP) and the emission side polarizing plate 53G can be efficiently suppressed.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, although the transmissive liquid crystal panel 50 has been described as an example of the light modulation element, the light modulation element is not limited to this. The light modulation element may be a reflective liquid crystal panel or a DMD (Digital Micromirror Device).

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... UV / IR cut filter, 30 ... Fly eye lens unit, 40 ... PBS array, 50 ... Liquid crystal panel, 51 ... Polarization state adjustment element, 52, 53 ... Polarizing plate, 60 ... Cross dichroic cube, 71-76 ... Mirror, 81-85 ... Lens, 100 ... Projection-type image display device, 110 ... Projection lens unit, 120 ... Lighting unit, 200 ... Control unit, 210 ... Video signal receiving unit, 220 ... Ye superposition amount calculation unit, 230 ... RGB correction unit, 240 ... Cooling capacity control unit, 300 , 310, 320...

Claims (5)

A red light modulation element that modulates red component light, a green light modulation element that modulates green component light, a blue light modulation element that modulates blue component light, the red light modulation element, the green light modulation element, and the blue light modulation A color synthesizing unit that synthesizes the light emitted from the element, and a polarization state adjusting element that adjusts a polarization state of the fourth color component light, the red component light, the green component light, and the blue component light Among them, the superimposed component light which is any color component light is a projection type image display device that enters the polarization state adjusting element together with the fourth color component light,
A first air blowing section for sending wind to the first polarizing plate provided on the light exit side of the polarization state adjusting element;
A second air blowing unit for sending wind to the second polarizing plate provided on the light emitting side of the specific light modulation element corresponding to the superimposed component light;
A control unit for controlling the cooling capacity of the first air blowing unit and the second air blowing unit,
The control unit controls a cooling capacity of the first air blowing unit based on a light amount of the fourth color component light blocked by the first polarizing plate.   2. The projection display according to claim 1, wherein the control unit controls a cooling capacity of the second air blowing unit based on a light amount of the superimposed component light shielded by the second polarizing plate. apparatus. A red light modulation element that modulates red component light, a green light modulation element that modulates green component light, a blue light modulation element that modulates blue component light, the red light modulation element, the green light modulation element, and the blue light modulation A color synthesizing unit that synthesizes the light emitted from the element, and a polarization state adjusting element that adjusts a polarization state of the fourth color component light, the red component light, the green component light, and the blue component light Among them, the superimposed component light which is any color component light is a projection type image display device that enters the polarization state adjusting element together with the fourth color component light,
A blower section for sending air to the first polarizing plate provided on the light exit side of the polarization state adjusting element and the second polarizing plate provided on the light exit side of the specific light modulation element corresponding to the superimposed component light;
A control unit for controlling the cooling capacity of the blower unit,
The air blowing section has a movable damper that changes the direction of the wind sent from the air blowing section,
The control unit controls a position of the movable damper based on a light amount of the superimposed component light shielded by the second polarizing plate.   4. The projection display according to claim 3, wherein the control unit controls the position of the movable damper based on a light amount of the fourth color component light shielded by the first polarizing plate. 5. apparatus. The specific light modulation element is a light modulation panel that modulates the superimposed component light,
The first polarizing plate is an incident side polarizing plate provided on the light incident side of the light modulation panel,
4. The projection display apparatus according to claim 1, wherein the second polarizing plate is an output-side polarizing plate provided on a light output side of the light modulation panel. 5.

Images