JP2009163075A - Projection type video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type video display apparatus that has high luminance and high reliability. <P>SOLUTION: The projection type video display apparatus includes: a light source 101; a plurality of optical modulation means 131, 132, and 133 that modulate light from the light source 101 according to a video signal; a projecting optical system component 160 for projecting light modulated by the plurality of light modulation means 131, 132, and 133; conduits 208 for supplying a fluid to the plurality of optical modulation means 131, 132, and 133; and a cooling means 200 for cooling the fluid. Out of the optical modulation means 131, 132, and 133, the first optical modulation means that has the greatest heating value is supplied with a fluid that is not supplied to the other optical modulation means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection display apparatus that modulates light emitted from a light source with an optical element and projects a modulated optical image with projection optical system components.

  Conventionally, this type of projection display apparatus, for example, a liquid crystal projector, includes a light source 301, an optical lens 320, a polarizing plate 340, a liquid crystal panel 335, and a composite optical device such as a dichroic prism as shown in FIG. The system component 350, the projection optical system component 360, and the like are mounted. The liquid crystal panel 335 functions as a so-called light valve that controls transmission of light in units of video pixels (for example, pixels), and modulates each color light according to video information. Each of the modulated color lights is projected onto a screen or the like by a projection optical system component 360, which is a projection light image synthesized by a synthesis optical system component 350 such as a dichroic prism.

  In such a liquid crystal projector, the light source 301, the liquid crystal panel 335, the polarizing plate 340 disposed before and after the light source 301, and the like are used as heat sources to heat the main body. Therefore, a heat radiating fan 404 or a blower fan 405 is installed on the outer frame of the main body, and the air (outside air) outside the liquid crystal projector is sent to the light source 301, the liquid crystal panel 335, and the liquid crystal panel 335 as shown by the arrows (shaded lines) in the figure. These were supplied (blowed) to the polarizing plate 340 and the like to cool them. In this case, the light source 301 has a very high temperature of about + 900 ° C. and can be sufficiently cooled by the outside air. However, the upper limit of the use temperature of the liquid crystal panel 335 is relatively low, and the upper limit of the use temperature is + 70 ° C. Therefore, it could not be cooled sufficiently. That is, the amount of heat released from the liquid crystal panel 335 is greatly affected by the outside air temperature. For example, when the outside air temperature is low, the liquid crystal panel 335 can be sufficiently cooled by the supplied outside air. When the outside air temperature was high, it could not be cooled sufficiently. Therefore, when the outside air temperature is high, it is necessary to increase the heat dissipation amount by increasing the air volume of the blower fan 405. For this reason, noise from the blower fan 405 increases and power consumption increases remarkably. There was also a risk of inconvenience.

  In recent years, in order to respond to the demand for an increase in the area of a projection screen such as a liquid crystal projector, it is required to increase the brightness of the light source. However, when the amount of light applied to the liquid crystal panel 335 increases, the amount of heat generation increases, and the amount of heat radiation is increased in achieving high brightness, such as the liquid crystal panel 335 being unable to cool below the upper limit of the operating temperature. The lack of was an issue.

In order to solve such problems, it has been proposed to cool the entire structure composed of a dichroic prism, a plurality of liquid crystal panels, and the like by generating low-temperature air with an electronic cooling element (see, for example, Patent Document 1). ).
JP-A-2005-121250

In the configuration described in Patent Document 1, when a plurality of light modulation means including a liquid crystal panel or the like are provided for each color, they are collectively cooled. However, since the amount of heat generated by each light modulation means varies depending on the wavelength and intensity of light irradiated to the light modulation means, the temperature of each light modulation means can be sufficiently controlled by cooling these light modulation means together. I can't do it. For this reason, when the light modulation means is not sufficiently cooled, there is a problem in that the operation failure or deterioration of the liquid crystal panel or the like is caused and the reliability of the projection display apparatus such as a liquid crystal projector is lowered.
In addition, when cooling is performed in accordance with the light modulation means that generates the largest amount of heat among the plurality of light modulation means, the light modulation means that is not required to be cooled is also cooled, so that the cooling efficiency of the entire projection display apparatus is improved. There was a problem of getting worse.

Furthermore, in order to respond to the demand for a large area of the projection screen of a liquid crystal projector or the like, when the light source is further increased in brightness, the amount of light applied to the liquid crystal panel or the like increases and the amount of heat generated by all the liquid crystal panels or the like. Will increase. For this reason, unless the cooling efficiency of the projection display device such as a liquid crystal projector is improved, the entire device becomes insufficiently cooled, and the liquid crystal panel cannot be controlled within the temperature range of the use limit, and the operation failure of the liquid crystal panel, etc. There is a problem that the reliability of a projection display such as a liquid crystal projector is reduced due to the deterioration.
Further, not only in a liquid crystal panel but also in a projector using reflective light modulation means such as DMD (Digital Micromirror Device), when the light source is further brightened, the amount of heat generated from the DMD due to reflection loss increases. Similarly, there is a possibility that the cooling capacity becomes insufficient and the life of the projector is reduced.

  The present invention solves the above-described problems, and provides a projection display device that is highly reliable even when the brightness is increased by efficiently cooling light modulation means such as a liquid crystal panel that generates a large amount of heat. To do.

  The projection display apparatus of the present invention includes a light source, a plurality of light modulation means for modulating light from the light source according to a video signal, and a projection optical system for projecting light modulated by the plurality of light modulation means. 1st light modulation means with the largest calorific value among a plurality of light modulation means, comprising a component, a flow path for supplying fluid to the plurality of light modulation means, and cooling means for cooling the fluid On the other hand, a fluid that is not supplied to other light modulation means is supplied.

  As a result, a fluid such as air cooled by the cooling means can be supplied to the light modulation means having the largest amount of heat generation without being heated by the other light modulation means, and the light modulation having the largest amount of heat generation is achieved. The means can be cooled strongly.

  On the other hand, since it is not necessary to perform unnecessary cooling on the light modulation means having a relatively small amount of heat generation, the cooling efficiency of the entire projection display apparatus can be increased. In addition, even when the brightness of the light source is increased, the cooling efficiency is improved, so that the light modulation means can be maintained in an appropriate temperature range, and the malfunction and deterioration of the light modulation means can be suppressed. The reliability of the display device can be increased.

  The flow path is separated into a first flow path and a second flow path, the first light modulation means is disposed in the first flow path, and the other light modulation means is disposed in the second flow path. You may do it. As a result, it is possible to supply the light modulation means with the largest amount of heat generation without being heated by the other light modulation means, and also to other light modulation means with a relatively small amount of heat generation. It can be supplied without being heated by the modulation means.

  Furthermore, by arranging each light modulation means individually in a plurality of flow paths, the cooling capacity of the cooling means and the air blowing capacity of the fluid transport means such as a fan are optimally set according to the amount of heat generated by each light modulation means. Can be adjusted. For this reason, the light modulation means with a large amount of heat generation is cooled strongly, and the light modulation means with a small amount of heat generation need not be subjected to unnecessary cooling. Efficiency can be increased. Furthermore, it is possible to suppress the occurrence of malfunction and deterioration of the light modulation means such as a liquid crystal panel by maintaining each light modulation means within an appropriate temperature range.

  In addition, the first light modulation unit and the other light modulation unit are arranged in one flow path, and the fluid supplied to the first light modulation unit is supplied to the other light modulation unit. May be. Thereby, the fluid after cooling the light modulation means having a large calorific value can be effectively used to cool the other light modulation means, so that the cooling efficiency of the entire projection display apparatus can be improved.

  In addition, a partition wall of the flow path has a first light transmitting part for transmitting light from the light source to the light modulating means and a second light transmitting part for transmitting light from the light modulating means to the projection optical system component. It is preferable to have. As a result, the light that enters the light modulating unit from the light source and the light modulating unit enters the projection optical system component by the first and second light transmitting parts without leaking the cooled fluid in the flow path to the outside air. Can transmit light.

  Furthermore, since the light modulation means that is irradiated with light in the green wavelength band has a larger amount of heat generation than the light modulation means that receives light in the other blue and red wavelength bands, the first light modulation means is Preferably, it is a light modulation means for modulating light in the green wavelength region.

  In the present invention, the flow path preferably has fluid transporting means such as a blower fan. Thereby, the supply amount of the fluid cooled by the cooling means can be increased, and it can cool strongly.

  Furthermore, it is preferable to adjust the cooling capacity of the cooling means or the blowing capacity of the fluid transport means according to the temperature rise of the light modulation means by providing temperature measuring means in the light modulation means. Thereby, more efficient cooling becomes possible.

  The light modulation means in the present invention may be a light transmission type such as a liquid crystal panel or a light reflection type such as DMD. In addition, a Peltier element can be used as the electronic cooling element used as the cooling means in the present invention. Furthermore, a dichroic prism can be used as the composite optical system component in the present invention.

  The projection display apparatus of the present invention can ensure high reliability even when the brightness is increased by efficiently cooling the light modulation means having a large calorific value such as a liquid crystal panel.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.
Example 1
FIG. 1 is a schematic diagram of an optical system configuration of a projection display apparatus according to Embodiment 1 of the present invention and Embodiments 2, 3, 4, and 7 described later.

  The projection display apparatus according to the embodiment of the present invention incorporates an optical system as shown in FIG. The optical system of the present invention includes a light source 101, an illumination optical system 102, dichroic mirrors 111 and 112 that separate light for each wavelength, reflection mirrors 115, 116, and 117, and optical lenses 120, 121, 122, and 123. , 124, light modulation elements 131, 132, 133, a composite optical system component 150, a projection optical system component 160, and the like.

  The light source 101 includes a lamp 101a such as an ultra-high pressure mercury lamp and a reflector 101b for emitting light (diverged light) emitted from the lamp 101a forward. Moreover, as the light source 101, you may use solid light sources, such as a laser and LED.

  The illumination optical system 102 converts the light emitted from the light source 101 into a parallel light flux having a uniform luminance distribution, and includes a fly-eye integrator, a condenser lens, a UV / IR cut filter, and the like. The dichroic mirrors 111 and 112 separate the parallel light flux from the illumination optical system 102 into light of each color (red, green, and blue) wavelength range. The dichroic mirror 111 extracts light in the red (R) wavelength region from the parallel light flux from the illumination optical system 102 and reflects it in the direction of the reflection mirror 115. Further, light in the green (G) wavelength region is extracted from the remaining light flux by the dichroic mirror 112 and reflected toward the optical lens 121, and the remaining light in the blue (B) wavelength region is reflected by the reflecting mirrors 116 and 117. Each color is separated by being reflected in the direction of the optical lens 122.

  The light beams separated into the wavelength regions of the respective colors are introduced into the light modulation elements 131, 132, and 133 corresponding to the respective colors by the optical lenses 120, 121, and 122. Specifically, light in the red wavelength range is introduced into the light modulation element 131, light in the green wavelength range is introduced into the light modulation element 132, and light in the blue wavelength range is introduced into the light modulation element 133.

  Each of the light modulation elements 131, 132, 133 modulates the light beam of each color according to the video information and introduces it to the combining optical system component 150. The combining optical system component 150 combines the light beams of the respective colors modulated by the light modulation elements 131, 132, and 133 and introduces them to the projection optical system component 160. The projection optical system component 160 displays an image or the like by enlarging and projecting the combined light flux on a screen or the like.

Here, the light modulation elements 131, 132, 133 are respectively disposed in the flow paths 208R, 208G, 208B partitioned by the partition wall 207X and the composite optical system component 150, respectively.
2, 3 and 4 show the configuration of the first embodiment. FIG. 2 is an enlarged cross-sectional view in the vicinity of the light modulation element in FIG. FIG. 3 is a schematic cross-sectional view of the configuration of Example 1 corresponding to the AA cross section of FIG. FIG. 4 is a schematic cross-sectional view of the configuration of the first embodiment corresponding to the BB cross section of FIG. In the figure, light transmission is indicated by white arrows, and air flow is indicated by hatched arrows. Further, in this embodiment, a configuration is shown in which the heat generation amount of the light modulation element 132 is the largest. However, when the heat generation amount of other light modulation elements is large, the light modulation having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

  As shown in FIG. 2, the light modulation element 131 includes a liquid crystal panel 135, a polarizing plate 140 provided with an interval on the incident side of the liquid crystal panel 135, and an interval on the output side of the liquid crystal panel 135. The polarizing plate 141 is provided. The liquid crystal panel 135 is separated by the dichroic mirror 111 and modulates the light in the red wavelength range guided to the liquid crystal panel 135 according to the video information. The light modulation element 132 includes a liquid crystal panel 136, a polarizing plate 142 provided with a gap on the incident side of the liquid crystal panel 136, and a polarizing plate provided with a gap on the output side of the liquid crystal panel 136. 143. The liquid crystal panel 136 modulates the light in the green wavelength band, which is separated by the dichroic mirror 112 and guided to the liquid crystal panel 136, according to the video information. Further, the light modulation element 133 is also composed of a liquid crystal panel 137 and polarizing plates 144 and 145 as in the case of the light modulation element 131, and the liquid crystal panel 137 is separated by the dichroic mirror 112 and guided to the liquid crystal panel 137. Is modulated in accordance with video information.

  In addition, the polarizing plates 140, 141, 142, 143, 144, and 145 can each be made into a set of two together with the pre-polarizing plate that prevents the polarizing plate from being damaged.

  The synthesizing optical system component 150 synthesizes light of each color to form a projected light image, and uses a dichroic prism or the like. The composite optical system component 150 includes a reflection surface made of an X-shaped dielectric multilayer film, and the light from the liquid crystal panels 135, 136, and 137 is combined through the reflection surface to form a single light beam. By being introduced into the projection optical system component 160, it is enlarged and projected on the screen.

  Next, the flow paths 208R, 208G, and 208B will be described.

As shown in FIG. 2, the flow path 208R in which the light modulation element 131 is accommodated and cooled air or the like is supplied includes an optical lens 120, a partition wall 207X that holds the optical lens 120, a composite optical system component 150, and It is formed by a space surrounded by a partition wall 207Y that holds the composite optical component 150. The flow path 208G in which the light modulation element 132 is accommodated and cooled air or the like is supplied includes the optical lens 121, the partition wall 207X that holds the optical lens 121, the composite optical system component 150, and the composite optical component 150. Is formed by a space surrounded by a partition wall 207Y that holds the. Further, the flow path 208B in which the light modulation element 133 is accommodated and cooled air or the like is supplied includes the optical lens 122, the partition 207X that holds the optical lens 122, the composite optical system component 150, and the composite optical component 150. Is formed by a space surrounded by a partition wall 207Y that holds the.
The flow path 208R, the flow path 208G, and the flow path 208B are separated from each other by a partition portion 209 that includes the composite optical system component 150 and a partition wall 207Y that holds the composite optical component 150.

  As shown in FIGS. 3 and 4, a cooling air tank 206 is provided on each of the light modulation elements 131, 132, 133 and the composite optical system component 150. The air in the cooling air tank 206 is cooled by the cooling means 200 installed in the upper part thereof. Here, the cooling means 200 includes a Peltier element 201, a Peltier element heat absorbing plate 202, a Peltier element heat radiating plate 203, and a heat radiating fan 204. A Peltier element heat absorbing plate 202 is provided on the lower surface side of the Peltier element 201, and a Peltier element heat dissipation plate 203 is provided on the upper surface side of the Peltier element 201. The air in the cooling air tank 206 is cooled by the Peltier element heat absorbing plate 202. Further, a heat radiating fan 204 for diffusing the heat of the Peltier element heat radiating plate 203 is provided.

  Note that a π-type Peltier element is used as the Peltier element 201 in the embodiment of the present invention. In the π-type Peltier element, a P-type semiconductor element and an N-type semiconductor element as thermoelectric conversion materials are alternately arranged between a heat-absorbing plate 202 and a heat-dissipating plate 203 arranged to face each other. A wiring pattern for alternately connecting P-type and N-type semiconductor elements in series is formed on the contact surface 203 of the semiconductor element. When a voltage is applied to the Peltier element 201, heat on the heat absorbing plate 202 side flows to the heat radiating plate 203 side. Thereby, the fluid in contact with the heat absorbing plate 202 is cooled, and the heat of one heat radiating plate 203 is diffused into the outside air by the heat radiating fan 204 and the like. The cooling capacity of the Peltier element 201 can be appropriately adjusted according to the amount of heat generated by changing the current flowing through the Peltier element 201 and the number of P-type and N-type semiconductor elements.

  The air cooled in the cooling air tank 206 is supplied to the spaces partitioned by the partition walls 207X and the like, that is, the flow paths 208R, 208G, and 208B through the openings 207a, and the light modulations respectively disposed therein. The elements 131, 132, 133 are cooled. With such a configuration, the light modulation element 132 having the largest amount of heat generation is supplied to the other light modulation elements 131 and 133 and cooled in the cooling air tank 206 instead of the air whose temperature has increased. The low-temperature air can be supplied, and the light modulation element 132 can be cooled strongly.

  Note that the amount of heat generated by each light modulation element in the present invention depends on whether the temperature of the light modulation element is high or low when a thermometer is installed in each light modulation element and the projection display apparatus is not cooled. It was evaluated with. That is, the light modulation element with the highest temperature is the light modulation element with the largest amount of heat generation.

  Here, the combining optical system component 150 and the partition wall 207Y that holds the combining optical component 150 include the flow path 208R of the light modulation element 131, the flow path 208G of the light modulation element 132, and the flow path 208B of the light modulation element 133. It is used as a partitioning part 209 for separating from each other. The partition wall 207 </ b> Y that holds the composite optical component 150 is disposed so as to be substantially flush with the side surface of the composite optical component 150. As a result, the fluid flowing into the flow path 208R of the light modulation element 131, the flow path 208G of the light modulation element 132, and the flow path 208B of the light modulation element 133 can be prevented from being mixed with each other, and A fluid is supplied to the lower part to prevent unnecessary cooling.

  Furthermore, by arranging each light modulation means 131, 132, 133 individually in the plurality of flow paths 208R, 208G, 208B, the cooling capacity of the cooling means 200 is optimally adjusted according to the amount of heat generated by each light modulation means. Can be adjusted. For this reason, the light modulation means 132 having a large amount of heat generation is strongly cooled, and the light modulation means 131 and 133 having a small amount of heat generation need not be subjected to unnecessary cooling. As a whole, the cooling efficiency can be increased. Furthermore, it is possible to suppress the occurrence of malfunction and deterioration of the light modulation means such as a liquid crystal panel by maintaining each light modulation means within an appropriate temperature range.

In the case of the present embodiment, the side surfaces of the optical lenses 120, 121, 122 and the composite optical system component 150 are used as a part of the partition wall and the partition wall, and are also used as a translucent part, and other parts are also used as the partition wall 207X and the partition part. Partition with wall 207Y. Thereby, the light modulation elements 131, 132, and 133 can be efficiently cooled without leaking the air cooled in the cooling air tank 206 to the outside air. Furthermore, by using the side surfaces of the optical lenses 120, 121, and 122 and the composite optical system component 150 as part of the partition wall and partition wall, it is possible to save space and reduce the amount of transmission on the optical path to attenuate light. This can contribute to higher brightness.
The cooling means 200 cools the air in the cooling air tank 206, and the cooled air is divided into partitions for each of the light modulation elements 131, 132, 133 as indicated by the hatched arrows in the figure. Each light modulation element 131, 132, 133 is cooled by being supplied by natural convection into the flow path separated by 207 or the like.
In this embodiment, as the cooling means 200, the Peltier element 201, the Peltier element heat absorbing plate 202, the Peltier element heat radiating plate 203, and the heat radiating fan 204 are used. A refrigerant circuit using a compressor may be used.

  In addition, the cooling means 200 such as the Peltier element 201 and the cooling air tank 206 can be installed only for the light modulation element that generates the largest amount of heat. Normally, the light modulation element 132 generates the largest amount of heat with respect to light in the green wavelength range. In this case, the cooling means 200 such as the Peltier element 201 and the cooling air tank 206 are installed only for the light modulation element 132. May be.

  By adopting these configurations, useless cooling can be suppressed, the cooling efficiency of the projection image display apparatus as a whole can be improved, and high reliability can be ensured even when the brightness is increased.

Here, the flow paths 208R, 208G, and 208B are spaces separated from the outside air by the partition wall 207X and the partition wall 207Y, and may be any space that allows fluid to circulate therein. Accordingly, the flow paths 208R, 208G, and 208B may be capable of flowing a fluid in one direction by using a partially opened partition wall such as a duct. As a result, it is possible to suppress the cause of a decrease in cooling efficiency, such as leakage of the cooled fluid into the outside air, or mixing of a normal temperature fluid from the outside air and raising the temperature of the cooled fluid. In addition, because the space is separated from the outside air, it is possible to prevent noise at the outside air outlet and outlet of the cooled fluid to the outside air, and to suck in dust etc. in the outside air. The causative danger can be reduced.
Note that the flow paths 208R, 208G, and 208B in the present embodiment do not need to be completely sealed with respect to the outside air, and the above-described effects can be realized even if there is a part that communicates with some outside air. Anything is acceptable.

  Moreover, it is preferable that the partition 207X and the partition wall 207Y are comprised with a heat insulating material. Thereby, it can suppress that the cooled air is warmed with the heat from the outside through the partition 207X and the partition wall 207Y. As the heat insulating material, the thermal conductivity of hard vinyl chloride, silicon resin, fluororesin, phenol resin, polycarbonate resin, polystyrene resin, etc. is about 0.1 W / (m · K) to 0.3 W / (m · K). Rubber and plastic materials can be used. Moreover, the thermal conductivity of glass-based materials such as quartz glass and glass ceramic having a thermal conductivity of about 1 W / (m · K) to 4 W / (m · K), or glass wool, rock wool, carbonized cork, etc. is 0. .0045 W / (m · K) or less of fiber-based heat insulating material, polystyrene foam, and a building heat insulating material or a vacuum heat insulating material composed of these can be used. In addition, it is also possible to use a material having a thermal conductivity of 1 W / (m · K) or less as the heat insulating material.

  As the fluid used in this embodiment, air is used, but it may be a gas such as an inert gas (for example, helium gas or nitrogen gas) or a liquid such as water. However, a color that does not absorb or reflect light that enters or exits the light modulation element, for example, a transparent fluid is preferable. In addition, gas is preferred because it is in direct contact with the light modulation element and affects light transmittance. Furthermore, air is preferable among gases because of ease of manufacturing. However, by using a gas such as helium having a high thermal conductivity, the amount of heat released from the light modulation means can be increased and the cooling efficiency can be improved. .

  The translucent part in the present embodiment may be anything that functions as a partition wall of the flow path and transmits light, and glass, transparent plastic, or the like can be used. Further, the entire partition wall 207X and partition wall 207Y may be formed of a light-transmitting material such as glass.

  The light modulation elements 131, 132, 133 are “a plurality of light modulation means” of the present invention, the flow paths 208R, 208G, 208B are “flow paths” of the present invention, and the cooling means 200 is “cooling” of the present invention. It is an example of “means”.

  The light modulation element 132 is the “first light modulation means” of the present invention, the light modulation element 131 or the light modulation element 132 is the “other light modulation means” of the present invention, and the flow path 208G is the “first light modulation means” of the present invention. The “flow path”, the flow path 208R or 208B is an example of the “second flow path”.

(Example 2)
5 and 6 show the configuration of the second embodiment. FIG. 5 is a schematic cross-sectional view of the configuration of Example 2 corresponding to the AA cross section of FIG. FIG. 6 is a schematic cross-sectional view of the configuration of the second embodiment corresponding to the BB cross section of FIG. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

In the present embodiment, the cooling air tank 206 to which the cooling means 200 is attached is disposed below the light modulation elements 131, 132, and 133. The cooling air tank 206 and the flow paths 208R, 208G, and 208B in which the light modulation elements 131, 132, and 133 are partitioned are communicated by the opening 207a, and the blower fan 205 is installed in the opening 207a. . The flow paths 208R, 208G, and 208B for the light modulation elements 131, 132, and 133 are the same as in the first embodiment, such as the optical lenses 120, 121, and 122, the partition wall 207X, the composite optical system component 150, the partition wall 207Y, and the like. Therefore, the light modulation elements 131, 132, and 133 are separated.
Cooled air in the cooling air tank 206 is sent to the flow paths 208R, 208G, and 208B by the blower fans 205 provided in the flow paths 208R, 208G, and 208B for the light modulation elements 131, 132, and 133. It is. As a result, the light modulation element 132 having the largest heat generation amount is supplied with the low temperature air supplied to the other light modulation elements 131 and 133 and cooled in the cooling air tank 206 instead of the air whose temperature has increased. The air fan 205 can be forcibly supplied and the light modulation element 132 can be cooled strongly.
Further, since the blower fan 205 is provided for each flow path 208R, 208G, 208B for each light modulation element 131, 132, 133, according to the amount of heat generated by each light modulation element 131, 132, 133, It is possible to adjust the air blowing amount by changing the air blowing capacity such as the rotation speed of the air blowing fan 205. Specifically, the air blowing amount of the lower blowing fan 205 having the largest heat generation amount is maximized, while the lower blowing fan 205 is applied to the other light modulation elements 131 and 133. By operating at a reduced air flow rate, the entire projection type image display apparatus can be efficiently cooled while maintaining all the light modulation elements in an appropriate temperature range.

  Other configurations are the same as those in the first embodiment.

(Example 3)
FIG. 7 shows the configuration of the third embodiment. This figure shows a schematic sectional view of the configuration of the third embodiment corresponding to the BB section of FIG. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

  As shown in the figure, the cooling air tank 206 to which the cooling means 200 such as the Peltier element 201 is attached is installed at a position away from the light modulation element 132. The cooling air tank 206 and the flow path 208G partitioned by the optical lens 121, the partition wall 207X, the composite optical system component 150, the partition wall 207Y, and the like are connected by the air duct (feed) 210 and the air duct (return) 211. ing. The air duct 210 and the air duct 211 are connected to the cooling air tank 206 through an opening 207a provided in the partition wall 207X. A blower fan 205 is disposed at a connection portion between the cooling air tank 206 and the blower duct 210.

  In FIG. 7, the light modulation elements 131 and 133 are not shown, but similarly to the light modulation element 132, the cooling air tank 206 is installed in each of the flow paths 208 </ b> R and 208 </ b> B and the air ducts (feeds). 210 and an air duct (return) 211 are connected to each other. Further, the flow paths 208R, 208G, and 208B for the light modulation elements 131, 132, and 133 are the same as in the first embodiment, and the optical lenses 120, 121, and 122, the partition wall 207X, the composite optical system component 150, and the partition wall. Each light modulation element 131, 132, 133 is separated by 207Y or the like.

  Here, for example, in the case of the light modulation element 132, the cooled air in the cooling air tank 206 is supplied to the flow path 208 </ b> G through the blower duct (feed) 210 by the blower fan 205 and is sent to the other light modulation elements. Without being supplied, the light modulation element 132 is directly blown. Thereby, the light modulation element 132 can be cooled strongly. The air blown onto the light modulation element 132 is returned to the cooling air tank 206 through the air duct 211 (return), and is cooled again by the cooling means 200 including the Peltier element 201 and the like. Thereafter, the air is sent again to the air duct 210 (feed) by the air blowing fan 205. In the case of the light modulation element 131 and the light modulation element 133, similarly, cooled air is supplied.

  As a result, the light modulation element 132 having the largest heat generation amount is supplied with the low-temperature air supplied to the other light modulation elements 131 and 133 and cooled in the cooling air tank 206 instead of the air whose temperature has increased. The air fan 205 can be forcibly supplied and the light modulation element 132 can be cooled strongly.

  Further, with such a configuration, the size of the cooling means 200 including the Peltier element 201 and the cooling air tank 206 can be set regardless of the installable space around the light modulation elements 131, 132, and 133. Increase design freedom. In particular, when a cooling circuit having a higher cooling capacity is used as the cooling unit 200, the cooling unit 200 can be installed without being limited to the installable spaces around the light modulation elements 131, 132, and 133.

  In addition, the cooling means 200, the cooling air tank 206, the blower fan 205, the blower duct 210, and the like are provided for each light modulation element, so that the cooling capacity and the blower of the cooling means 200 are increased according to the heat generation amount of each light modulation element. The blowing capacity of the fan 205 can be adjusted. Specifically, the cooling capacity of the cooling means 200 for the light modulation element 132 having the largest heat generation amount is maximized, or the air blowing amount of the blower fan 205 is maximized, while the other light modulation elements 131 and 133 are compared. Thus, by operating the cooling means 200 for these light modulation elements while suppressing the cooling capacity of the cooling means 200 and the air blowing amount of the blower fan 205, all the light modulation elements are maintained in an appropriate temperature range, and then the projection type image is displayed. The entire display device can be efficiently cooled.

  Furthermore, the cooling means 200, the cooling air tank 206, the blower fan 205, the blower duct 210, and the like can be installed only for the light modulation element 132 that generates the largest amount of heat. By so doing, unnecessary cooling is not performed, so that the overall cooling efficiency can be improved.

  Other configurations are the same as those in the first embodiment.

Example 4
8 and 9 show the configuration of the fourth embodiment. FIG. 8 is a top view showing a planar arrangement of the flow paths. FIG. 9 is a schematic diagram showing the flow of cooling air to the flow paths for the respective light modulation elements in a planar manner. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.
As shown in FIG. 8, the light modulation elements 131, 132, and 133 are installed in the flow paths 208R, 208G, and 208B for each light modulation element. Further, the flow paths 208R, 208G, and 208B for the light modulation elements 131, 132, and 133 are the same as in the first embodiment, and the optical lenses 120, 121, and 122, the partition wall 207X, the composite optical system component 150, and the partition wall. Each light modulation element 131, 132, 133 is separated by 207Y or the like.
Further, as shown in FIG. 9, the cooling air tank 206 to which the cooling means 200 such as the Peltier element 201 is attached is connected to the air duct (feed) 210 and the air duct (return) 211. The air duct (feed) 210 is branched into a plurality of air ducts (feeds) 210 corresponding to the respective light modulation elements on the way, and connected to the flow paths 208R, 208G, and 208B for the respective light modulation elements. On the other hand, a plurality of air ducts (returns) 211 are connected to the outlet sides of the flow paths 208R, 208G, and 208B for the respective light modulation elements, and they are bundled in one air duct (return) 211 on the way. . In addition, a blower fan 205 is disposed at a connection portion between the plurality of blown ducts (feeds) 210 after being branched and the flow paths 208R, 208G, and 208B for the respective light modulation elements.
As a result, the cooled air in the cooling air tank 206 is connected to the cooling air tank 206, and the air flow for each light modulation element is sent by the blower fan 205 through the blower duct (feed) 210 branched into a plurality on the way. It is divided and supplied to paths 208R, 208G, and 208B. Thereby, each of the light modulation elements 131, 132, and 133 is cooled. After that, after flowing out from the flow paths 208R, 208G, 208B for the respective light modulation elements to the plurality of air ducts (returns) 211, they are merged by one bundled air duct (return) 211, and again the cooling air tank Return to 206.
Thus, the light modulation elements 131, 132, and 133 are supplied with the other light modulation elements, not the air whose temperature has increased but the low-temperature air that has been cooled in the cooling air tank 206, and the blower fan 205. Can be forcibly supplied. Therefore, even if any of the light modulation elements 131, 132, and 133 is the light modulation element that generates the largest amount of heat, it can be cooled strongly.

  Moreover, by taking such a structure, according to the emitted-heat amount of each light modulation element, the ventilation capability of the ventilation fan 205 corresponding to it can be adjusted. For example, when the amount of heat generated by the light modulation element 132 is the largest, the amount of air blown by the blower fan 205 for the light modulation element 132 is maximized, while the other light modulation elements 131 and 133 have these light modulation elements. By operating the air blowing fan 205 while suppressing the air blowing amount, the entire projection type image display apparatus can be efficiently cooled while maintaining all the light modulation elements in an appropriate temperature range.

  Further, according to the configuration of the present embodiment, it is necessary to provide a plurality of cooling means 200 and cooling air tanks 206 even when supplying cooled air to a plurality of light modulation elements, compared to the configuration of the third embodiment. Therefore, the structure of the projection display apparatus can be simplified, the projection display apparatus can be miniaturized, and the installation space for the projection display apparatus can be reduced.

(Example 5)
10 and 11 show the configuration of the fifth embodiment. FIG. 10 is a top view showing the planar arrangement of the flow paths and the air flow. Further, FIG. 11 is a schematic diagram showing the flow of cooling air to the flow path for each light modulation element developed in a plane. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

  As shown in FIG. 10, the light modulation elements 131, 132, and 133 are arranged together in a flow path 208 that is partitioned by a partition wall 207 </ b> X, a composite optical system component 150, and the like. Further, a wind direction guiding wall 212 is disposed between the light modulation element 131 and the light modulation element 132, and between the light modulation element 132 and the light modulation element 133, with the lower side closed and the upper side opened. Thereby, the air blown onto the light modulation element 132 flows into the light modulation element 131 and the light modulation element 133 side through the opening of the wind direction guiding wall 212.

As shown in FIG. 11, the cooling air tank 206 to which the cooling means 200 such as the Peltier element 201 is attached is connected to the air duct (feed) 210 and the air duct (return) 211. The air duct (feed) 210 is connected to a position below the light modulation element 132 in the flow path 208. On the other hand, a plurality of air ducts (returns) 211 are connected to positions below the light modulation elements 131 and 133 in the flow path 208, and they are bundled in one air duct (return) 211 on the way. A blower fan 205 is disposed at a connection portion between the cooling air tank 206 and the blower duct (feed) 210.
Thus, the cooled air in the cooling air tank 206 is blown to the light modulation element 132 by the blower fan 205 through the blower duct (feed) 210 connected to the cooling air tank 206. Thereafter, the air blown to the light modulation element 132 changes the wind direction from top to bottom by the wind direction guide wall 212 and is divided into two directions and blown to the light modulation element 131 and the light modulation element 133, respectively. The air blown to the light modulation element 131 and the light modulation element 133 is sent to the air duct (return) 211 and returns to the cooling air tank 206 again through the air duct (return) 211.
By adopting such a configuration, cooling light that is supplied to the other light modulation elements 131 and 133 and has not risen in temperature is supplied to the light modulation element 132 that generates the largest amount of heat, and cooling is preferentially performed. can do. Furthermore, by supplying the air after being supplied to the light modulation element 132 to the other light modulation elements 131 and 133, the cooling air can be used effectively, and the overall cooling efficiency can be improved.
Note that the air returned to the cooling air tank 206 through the air duct 211 is cooled again by the cooling means 200 such as the Peltier element 201 and is sent again into the air duct 210 by the air fan 205.

  Other configurations are the same as those in the first embodiment.

(Example 6)
12 and 13 show the configuration of the sixth embodiment. FIG. 12 is a top view showing the planar arrangement of the flow paths and the air flow. FIG. 13 is a schematic diagram showing the flow of cooling air to the flow paths for the respective light modulation elements in a planar manner. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

  As shown in FIG. 12, the light modulation elements 131, 132, 133 are arranged together in a flow path 208 partitioned by a partition wall 207X, a composite optical system component 150, and the like. Further, between the light modulation element 132 and the light modulation element 133, there is disposed a wind direction guiding wall 212 that is closed on the lower side and opened on the upper side. Further, between the light modulation element 131 and the light modulation element 133, there is disposed a wind direction guiding wall 212 that is closed on the upper side and opened on the lower side. Thereby, the air blown to the light modulation element 132 flows into the light modulation element 133 side through the opening of the wind direction guiding wall 212. Further, the air blown to the light modulation element 133 flows into the light modulation element 131 side through the opening of the wind direction guiding wall 212.

  As shown in FIG. 13, the cooling air tank 206 to which the cooling means 200 such as the Peltier element 201 is attached is connected to the air duct (feed) 210 and the air duct (return) 211. The air duct (feed) 210 is connected to a position below the light modulation element 132 in the flow path 208. On the other hand, a blower duct (return) 211 is connected to a position above the light modulation element 131 in the flow path 208. A blower fan 205 is disposed at a connection portion between the cooling air tank 206 and the blower duct (feed) 210.

  Thus, the cooled air in the cooling air tank 206 is blown to the light modulation element 132 by the blower fan 205 through the blower duct (feed) 210 connected to the cooling air tank 206. Thereafter, the air blown to the light modulation element 132 is blown to the light modulation element 133 by changing the wind direction from top to bottom by the wind direction guide wall 212. Further, the air blown to the light modulation element 133 is blown to the light modulation element 131 by changing the wind direction from the bottom to the top by the wind direction guide wall 212. The air blown onto the light modulation element 131 is sent to the air duct (return) 211 and returns to the cooling air tank 206 again through the air duct (return) 211.

By adopting such a configuration, cooling light that is supplied to the other light modulation elements 131 and 133 and has not risen in temperature is supplied to the light modulation element 132 that generates the largest amount of heat, and cooling is preferentially performed. can do. Furthermore, by supplying the air after being supplied to the light modulation element 132 to the other light modulation elements 131 and 133, the cooling air can be used effectively, and the overall cooling efficiency can be improved. Further, since the light modulation element 133 with respect to light in the blue wavelength region has the largest amount of heat generation after the light modulation element 132, cooling air is blown onto the light modulation element 133 next to the light modulation element 132. Thereby, cooling air can be utilized more effectively.
The air returned to the cooling air tank 206 through the air duct 211 is cooled again by the cooling means 200 such as the Peltier element 201 and sent to the air duct 210 by the air fan 205.

  Other configurations are the same as those in the first embodiment.

(Example 7)
FIG. 14 shows the configuration of the seventh embodiment. This figure shows a schematic sectional view of the configuration of the seventh embodiment corresponding to the BB section of FIG. In the present embodiment, the light modulation element 132 has the largest heat generation amount. However, when the other light modulation elements have large heat generation amounts, the light modulation element having the largest heat generation amount is appropriately selected. The element may be replaced with the position of the light modulation element 132.

As shown in the figure, a temperature sensor 213 is installed on the light modulation element 132 that generates the largest amount of heat, and the temperature of the light modulation element 132 is detected. Also, a temperature sensor 213 is installed outside the partition wall 207 to detect the outside air temperature. The controller 214 receives the information on the light modulation element 132 and the outside air temperature detected by the temperature sensor 213, and starts the cooling means 200 such as the Peltier element 201 when the temperature of the light modulation element 132 exceeds the upper limit set temperature. Then, the cooling capacity is increased, and cooling is performed so that the temperature is lower than the upper limit set temperature. On the other hand, if the cooling is excessively performed and the temperature becomes lower than the lower limit set temperature, the cooling is stopped or the capacity is reduced so that the temperature becomes equal to or higher than the lower limit set temperature. Thereby, the temperature control of the light modulation element 132 can be performed more precisely, the deterioration of the light modulation element 132 can be suppressed, and the reliability of the projection display apparatus can be improved.
Further, the blowing capacity of the blower fan can be adjusted by the temperature sensor 213 and the controller 214 in the same manner.
In addition, the temperature sensor 213 is installed also about the other light modulation elements 131 and 133, and the ventilation capability of each ventilation fan can also be adjusted similarly by the controller 214. FIG. As a result, the temperature of the other light modulation elements 131 and 133 can be controlled more precisely, and deterioration of the light modulation elements can be suppressed and the reliability of the projection display apparatus can be improved.

Other configurations are the same as those in the second embodiment.

  As described above, since the projection display apparatus according to the present invention can increase the reliability and increase the brightness, it can be applied to applications such as image display on a large screen that requires a large amount of light. it can.

It is the schematic of the optical system structure of the projection type video display apparatus in Example 1, 2, 3, 4 and 7 of this invention. FIG. 2 is an enlarged cross-sectional view of the vicinity of the light modulation element in FIG. 2 is a schematic cross-sectional view corresponding to the AA cross section of FIG. 1 in Example 1. FIG. FIG. 2 is a schematic cross-sectional view corresponding to a BB cross section of FIG. 1 in Example 1. FIG. 6 is a schematic cross-sectional view corresponding to the AA cross section of FIG. FIG. 4 is a schematic cross-sectional view corresponding to a BB cross section of FIG. FIG. 6 is a schematic cross-sectional view corresponding to a BB cross section of FIG. 1 in Example 3. 10 is a top view showing a planar arrangement of flow paths in Example 4. FIG. FIG. 10 is a schematic diagram illustrating a flow of cooling air flowing into a flow path for each light modulation element in Example 4 in a planar manner. It is a top view which shows the planar arrangement | positioning of the flow path in Example 5, and the flow of air. FIG. 10 is a schematic diagram illustrating a flow of cooling air to flow paths for each light modulation element in Example 5 in a planar manner. It is a top view which shows the planar arrangement | positioning of the flow path in Example 6, and the flow of air. FIG. 10 is a schematic diagram showing a flow of cooling air flowing into a flow path for each light modulation element in Example 6 in a planar manner. FIG. 9 is a schematic cross-sectional view corresponding to a BB cross section of FIG. 1 in Example 7. It is a figure which shows the structure of the conventional liquid crystal projector.

Explanation of symbols

101, 301 Light source 101a Lamp 101b Reflector 102 Illumination optical system 111, 112 Dichroic mirror 115, 116, 117 Reflection mirror 120, 121, 122, 123, 124, 320 Optical lens 131, 132, 133 Light modulation element 135, 136, 137 335 Liquid crystal panel 140, 141, 142, 143, 144, 145, 340 Polarizing plate 150, 350 Composite optical system component 160, 360 Projection optical system component 200 Cooling means 201 Peltier element 202 Peltier element heat sink 203 Peltier element heat sink 204 , 404 Radiation fan 205, 405 Blower fan 206 Cooling air tank 207X Partition wall 207Y Partition wall 207a Partition opening 208, 208R, 208G, 208B Channel 209 Partition section 210 Blower (Feed)
211 Air duct (return)
212 Wind direction guiding wall 213 Temperature sensor 214 Controller

Claims (10)

A light source, and a plurality of light modulation means for modulating light from the light source according to a video signal;
A projection optical system component for projecting light modulated by the plurality of light modulation means;
A flow path for supplying fluid to the plurality of light modulation means;
Cooling means for cooling the fluid,
A projection-type image display apparatus, wherein the fluid that is not supplied to the other light modulation means is supplied to the first light modulation means that generates the largest amount of heat among the plurality of light modulation means. . The flow path is separated into a first flow path and a second flow path, the first light modulation means is disposed in the first flow path, and the other light modulation is disposed in the second flow path. 2. The projection display apparatus according to claim 1, wherein means is arranged.   The projection display apparatus according to claim 2, wherein the first flow path and the second flow path are separated by a partitioning portion. The projection type image display device further includes a synthesis optical system component that synthesizes the light modulated by the plurality of light modulation units, and the partition portion includes the synthesis optical system component. The projection-type image display device described. The first light modulation means and the other light modulation means are arranged in one flow path, and the fluid supplied to the first light modulation means is supplied to the other light modulation means. The projection display apparatus according to claim 1, wherein: A partition wall of the flow path has a first light transmitting portion for transmitting light from the light source to the light modulation means, and a second for transmitting light from the light modulation means to the projection optical system component. The projection display apparatus according to claim 1, further comprising a light-transmitting portion. The projection image display apparatus according to claim 1, wherein the first light modulation unit is a light modulation unit for modulating light in a green wavelength region. The projection display apparatus according to claim 1, wherein the flow path includes a fluid transporting unit that allows the fluid to flow in a certain direction. 7. The projection display apparatus according to claim 6, wherein at least one of the first and second light transmitting portions of the flow path is configured by an optical lens. The projection display apparatus includes a temperature measurement unit that measures the temperature of the light modulation unit, and the cooling capability of the cooling unit or the blowing capability of the fluid transport unit is determined based on temperature information from the temperature measurement unit. The projection display apparatus according to claim 1, wherein the projection type image display apparatus is adjusted.

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