JPH08234155A - Projection type image display device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the cooling efficiency of an intake side cooling fan unit of a projection type image display device, to reduce the size of the device, reduce noise, and reduce power consumption. [Structure] In a duct of a cooling fan unit, which is composed of an intake cooling fan and a duct, at the outlet of cooling air corresponding to each RGB, according to the heat generation amount of liquid crystal panel and polarizing plate parts, A distribution guide plate for allocating the air volume of each cooling air and a wind guide plate for collecting the air volume of the unused area of the cooling fan were constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for enlarging and projecting an output signal from a personal computer or an image such as a CD / video on a screen or the like, and more particularly to a cooling device for the image display device.

[0002]

2. Description of the Related Art A conventional projection type image display device will be described with reference to FIGS. Some projection type image display devices of this type use three liquid crystal panels 3R, 3G and 3B of red, green and blue (hereinafter referred to as R, G and B). Such a projection-type image display device includes a light source 1 that emits light L, a reflection system 10 that decomposes the light L into R, G, and B components LR, LG, and LB, and RGB components LR, LG, and L.
Three liquid crystal panels 3 in which only one component of B is incident
A magnifying projection lens system 20 that superimposes the respective components LR, LG, and LB that have passed through R, 3G, and 3B onto a screen (not shown) and a cooling fan 4 that cools the liquid crystal panels 3R, 3G, and 3B. And a cabinet 5 for storing these
And have.

The reflection system 10 has a component L as shown in FIG.
First dichroic mirror-1 that passes only R and LG
11, a second dichroic mirror-112 that passes only the component LG, a third dichroic mirror-113 that passes only the component LB, and a fourth dichroic mirror-114 that passes only the components LR and LB. First to third total reflection mirrors that reflect all the reflected components
101 to 103. Reference numeral 6 shown in FIG. 4 is an infrared / ultraviolet blocking filter.

On the liquid crystal panel 3G on which an image corresponding to the component LG is displayed, the component LG which has passed through the first dichroic mirror 111 and the second dichroic mirror 112.
Is incident. Further, the liquid crystal panel 3R on which the image corresponding to the component LR is displayed has the first dichroic mirror-1.
After passing through 11, the component LR selectively reflected by the second dichroic mirror 112 is incident. Further, the liquid crystal panel 3 on which an image corresponding to the component LB is displayed
The component LB selectively reflected by the first dichroic mirror 111 and reflected by the second total internal reflection mirror 102 is incident on B. The component LB that has passed through the liquid crystal panel 3B and the component LR that has passed through the liquid crystal panel 3R are incident on the third dichroic mirror-113. The component LG that has passed through the liquid crystal panel 3G is the third total reflection mirror.
It is incident on the fourth dichroic mirror-114 via 103. The components LR and LB incident on the third dichroic mirror-113 are also incident on the fourth dichroic mirror-114, so that the components LR, LG and LB on the fourth dichroic mirror-114 are also incident.
Are superimposed and projected on the screen through the magnifying projection lens 20.

Since a high-intensity metal halide lamp is used as the light source 1, the temperature inside the cabinet becomes high. In addition, in the incident side polarization plates 2R, 2G, and 2B, S wave or P
Since either one of the light components of the wave is passed through, heat is generated by the light that does not pass through. Furthermore, the liquid crystal panel 3
In R, 3G, and 3B, the light components LR, LG, and LB that pass through generate heat. The cooling is performed by the cooling fan 4, and the state of the cooling will be described further in detail around the liquid crystal panel 3R.

As shown in FIG. 5, a condenser lens 6R and an incident side polarization plate 2R are provided on the light source side of the liquid crystal panel 3R. On the other hand, on the rear side of the liquid crystal panel 3R, an emission side polarizing plate 7R is provided integrally with the liquid crystal panel. Further, a transparent air guide plate 8 is provided behind the exit side polarizing plate 7R. The respective components around the liquid crystal panel are formed with a predetermined interval through which the cooling air W from the cooling fan 4 can pass. Therefore, the heat generated in the incident side polarization plate 2R and the liquid crystal panel 3R can be radiated by the cooling air W.

[0007]

However, the above-mentioned projection type image display device does not consider the distribution of the cooling air W passing between the respective components. At present, it is impossible to distribute the cooling air W because the amount of airflow passing between the respective components is automatically determined by the flow path resistance due to the space between the respective components and the unevenness of the flow path surface. The amount of heat generated by the liquid crystal panel 3R and the polarizing plate 2R is generally larger in the polarizing plate that blocks half of the light from the light source, and the amounts of heat generated are generally different. Therefore, it is desirable to set the flow rate of the cooling air W passing through both sides of the incident polarizing plate 2R to be larger than the flow rate passing through both sides of the liquid crystal panel 3R. Conventionally, it is the actual situation that the air volume is not adjusted only by the intervals between the components for adjusting the position of the liquid crystal panel after assembly. Providing an extra air volume to a place where the air volume is not required increases the total air volume of the whole, resulting in performance deterioration such as an increase in fan size, power consumption, and noise.

The present invention not only efficiently distributes the cooling air of the liquid crystal panel, but also increases the air volume of the air outlet near the center of the fan and collects the cooling air that has cooled the liquid crystal panel again, so that the other heat generating parts can be cooled. The present invention relates to a general invention of a cooling fan unit of a cooling air intake part of a projection type image display device, such as a method applied to cooling, a cooling method for a polarizing device, an efficient blowing shape of a blowing port, and the like. Type image display device is downsized, power consumption is reduced, and noise is reduced.

[0009]

A first means for solving the above problems relates to a method for efficiently cooling a liquid crystal panel and a polarizing plate. In a duct of a cooling fan unit composed of a fan and a duct of the projection type image display device of the present invention, a guide plate for air volume distribution is formed at the outlet corresponding to RGB by changing the height of the guide plate. Is.

A second means for solving the above problem is R
The air-collecting guide plate is formed in the blowout port of the GB near the center of the cooling fan together with the distribution guide plate.
It is important that the tip of the air collecting guide plate is configured to blow into the blower outlet at a position near the center of the fan.

A third means for solving the above-mentioned problem is to construct a recovery guide plate for recovering the cooling air having passed through the liquid crystal panel and the polarizing plate into the second RGB outlets. A fourth means for solving the above-mentioned problem is to configure an air guide section for changing the direction of the cooling air in any other blow section except the RGB blow openings.

A fifth means for solving the above problem is to limit the number of outlets of a cooling fan unit consisting of a cooling fan and ducts to six for RGB, for a video / audio circuit, for a lamp power supply and for a polarizing device. There is something I did.

[0013]

In the above-mentioned first means, the distribution guide plates are formed in two stages so as to oppose the rotation direction of the fan and the heights thereof are changed. Therefore, the cooling air impinging on the guide plates changes its direction. Instead, it is distributed to the cooling air of the liquid crystal panel and the polarizing plate and blown out from the air outlet. The amount of each distributed air flow can be easily adjusted by the height of the guide plate configured in two stages.

The second means collects the cooling air in the unused portion in the duct by the air collecting guide plate, and the cooling air collected along the air collecting guide plate has the smallest air volume at the outlet. It can be collected at.

The third means forms the recovery guide plate between the second outlet of the polarization synthesizing unit and the shield case forming the outside thereof, so that the polarization synthesizing unit and the shield case are formed. The cooling air gathers again in the area surrounded by the recovery guide plate and can be used as new cooling air for radiating heat from other heat generating portions.

The fourth means changes the flow direction of the cooling air coming out of the blow-out port to one direction, so that the heat-generating portion can be concentratedly cooled and the heat radiation effect is large.

In the fifth means, the number of outlets is limited to six, so that the cooling air volume emitted from the cooling fan unit can be used efficiently.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. First, the overall configuration of the device will be described with reference to FIG. FIG. 3 is a schematic configuration diagram showing an embodiment of the projection type image display device of the present invention. The minimum necessary component structure is shown for the sake of clarity. 1 is a light source of a metal halide lamp, 11 is a polarizing device, 12 is a cold filter, 1
3, 14, 15, 16 are separate or combined dichroic mirrors, and 17, 18 are total internal reflection mirrors. The RGB liquid crystal panels 3R, 3G, 3B corresponding to the three primary colors of light and the incident side polarization plates 2R, 2G, 2B are each configured in a predetermined manner. 20 is a projection lens. Reference numeral 4 is an intake cooling fan, and 19 is a duct, and these two parts are referred to as an intake cooling fan unit. Reference numeral 21 is a video / audio circuit 22 is a power source circuit for a light source. Reference numeral 23 is an exhaust cooling fan unit including a duct and an exhaust fan. 38
Is the shield case of this device. In addition, FIG. 3 is a configuration diagram viewed from the back side of the apparatus, that is, the side with the cooling fan,
On the opposite side of the duct 19, a separating and combining unit having substantially the same shape is integrally formed.

In the projection type image display device of the present invention having the above structure, the light L emitted from the light source 1 passes through the polarization device 11, but only a predetermined light component P (S) wave passes through. Further, infrared rays and ultraviolet rays other than visible light are cut by the cold filter 12 and are incident on the dichroic mirrors 13 and 14. The lights separated into the wavelengths corresponding to RGB respectively enter the incident polarization plates 2 and the liquid crystal panel 3, and the modulated lights are combined dichroic mirrors 15 and 16 respectively.
Are combined by the projection lens 20 and enlarged and projected onto a screen (not shown) by the projection lens 20. Person, intake cooling fan 4
Is configured to cool the respective polarizing plate 2 and the liquid crystal panel 3 from the respective RGB outlets 24 by the cooling air sucked from the outside air.

Next, the first characteristic of the intake cooling fan unit of the device of the present invention will be described in detail with reference to FIGS. 1 and 2. 1 is a duct 1 of the cooling fan unit shown in FIG.
FIG. 9 is a plan view illustrating 9 in detail. 2 is a sectional view taken along line AA of FIG. 1 and 2, the RGB outlet 24
The first guide plate 26 is continuously formed so as to oppose the rotation direction 25 of the cooling fan 4. The height of the first guide plate is the same as that of the rib 19a forming the duct 19. A second guide plate 30 (distribution guide plate) is provided in the B outlet 24B in parallel with the first guide 26.
Is configured. The height of the distribution guide plate 30 is set lower than that of the first guide plate. Reference numeral 31 is a partition inside the duct. Reference numeral 32 is a wind collecting guide plate. The partition 31 and the wind collecting guide plate 32 are provided at the same height as the rib 19a. Reference numeral 33 is a cover provided with holes 33a through which the cooling air from the cooling fan 4 passes. By the cover, the cooling air from the cooling fan unit 19 is supplied to the RGB outlets 24,
The air is blown out of the unit through the six flow paths 27, 28 and 29.

[0021] Keep the present invention the cooling fan unit having the above configuration, first the first guide plate 26, the cooling air W blown by the cooling fan 4, W ₁ shown by a broken line in FIG. 1
~ Works like W ₃ . However, the guide plate 26
In this case, the collected cooling air W is strongest just below the first guide plate, and becomes weaker away from it. In particular,
An outlet 24B formed near the center of the cooling fan 4
Then, this tendency appears as a remarkable phenomenon. Therefore, although the wind speed of the liquid crystal panel 3B located immediately below the guide plate 26 can obtain a sufficient wind speed, the polarizing plate 2 away from this
The cooling air of B is not sufficient.

Therefore, when the distribution guide plate 30 is formed at the outlet 24B, new cooling air W ₀ is obtained from the distribution guide plate 30 as shown in FIG. 2, and the polarizing plate 2B located immediately below this cooling air W ₀ is cooled. Efficiency is improved. The relationship is illustrated in FIGS. 6 and 7 for easy understanding. FIG. 6 shows the wind velocity distribution immediately below the first guide plate 26 when it is constructed.
The cooling air W ₁ from the cooling fan 4 hits the first guide plate 26 and changes its direction to the direction of the outlet 24B. Looking at the wind velocity distribution in the outlet opening width, as shown in FIG. The position directly below the plate 26 is the strongest.

FIG. 7 shows a first guide plate 26 and a distribution guide plate 30.
This is the wind velocity distribution when both are configured at the same time. As shown in FIG. 7, due to the action of the distribution guide plate 30, a strong wind speed W ₀ is newly obtained directly under the distribution guide plate, and the wind speed distribution shown in the graph is obtained. Therefore, cooling of the polarizing plate formed under the distribution guide plate 30 is promoted, and both the liquid crystal panel and the polarizing plate can be efficiently cooled.

The magnitudes of the wind speed immediately below the first guide plate 26 and the wind speed immediately below the distribution guide plate 30 shown in FIG. 7 can be set by the height h of the distribution guide plate.

In the device of the present invention, the case where the distribution guide plate is used only in the blowout port of the B part of RGB has been disclosed, but it goes without saying that it can be naturally applied to the blowout ports other than the B part if the distribution is required. . The reason why the distribution guide plate is used only in the B section in this embodiment is as follows. That is, in the projection image device of the present invention, in order to reduce the size of the entire device, the RGB outlets are designed to fit within the projected area of the cooling fan 4 as much as possible. For this reason, of the cooling air blown into RGB, the air volume of the portion B near the center of the fan is reduced. FIG. 8 shows the distribution of the wind speed emitted from the cooling fan. As shown in FIG. 8, in the axial fan, the motor located at the center of the fan is used.
The wind speed at the center tends to be low due to the rotor 4a.

The second feature of the present invention resides in the wind collecting guide plate 32. As described above, the air volume of the air outlet 24B located at the center of the fan is smaller than that of the other air outlets. Therefore, the amount of air blown by the air collecting guide plate 32 to the region 34 that is not substantially used is adjusted to the air outlet 24.
They were collected in B. The position of the tip end 32a of the wind collecting guide plate 32 is determined by the size S of the frontage of the outlet 24B.
It is desirable that the position is about 1/3 of the above. As a result, the cooling air from the unused area 34 can be collected not only at the center of the fan, which has the smallest air flow rate, but also has a small effect on the original flow of the cooling air W ₁ .

Third embodiment of the third feature of the present invention FIG.
This will be described with reference to FIG. FIG. 9 is a view as seen from the separation / synthesis unit side of FIG. FIG. 10 is a DD sectional view of FIG. Only the components that describe the third feature are shown. In FIG. 9 and FIG. 10, on the upper surface of the separation / combination unit 36, second outlets 35 are formed corresponding to RGB. 37 is on the separation and synthesis unit 36,
The recovery guide plate is configured to surround the second outlet 35. 38 is a shield case for noise reduction, 3
Reference numeral 9 is a semiconductor formed on the lamp power supply circuit 22.

In FIG. 10 of the device of the present invention having the above-mentioned structure, the cooling air W blown from the fan 4 enters the separation synthesis through the duct 19 and the outlet 24B to cool the liquid crystal panel 3B and the like. After that, it flows out of the separation / combination unit 36 from the second outlet 35B. The cooling air that has flowed out flows into a gap 40 surrounded by the shield case 38 and the recovery guide plate 37, and acts to remove heat from a heat sink 41 integrally formed with the semiconductor 39 of the lamp power supply circuit. The third feature of the present invention is to collect the cooling air used for cooling once and use it again for cooling other heat generating components. As shown in FIG. 9, in the present embodiment, two of the second outlets 35B and 35G are surrounded by the recovery guide plate 37, but naturally one can also perform the same operation. Further, the recovery guide plate 37 forms a gap 40 between the shield case 38 and the separating / combining unit 36 to form a flow path for the cooling air flowing out from the second blowout port 35. The recovery guide plate 37 without using the gas 38 as a part of the flow path.
The third feature can be achieved even if the cover is integrally formed and the flow paths are independently formed.

Next, the fourth feature of the present invention will be described with reference to FIG. FIG. 11 is a schematic view of the CC cross section of FIG. Reference numeral 29a denotes an air guide portion formed at the tip of the outlet 29 to change the flow of cooling air. The cover 33 side becomes thicker as it approaches the outlet, and the duct side is chamfered at the outlet end. The cooling air generated by the cooling fan 4 generates a flow W ₇ that cools the liquid crystal panel 3R, the polarizing plate 2R, and the like, and a flow W ₈ that flows toward the blowout port 29. The cooling air W ₈ is blown out at an outlet 29, and its flow direction is changed by an air guide portion 29a having a slope and a chamfer. As shown in FIG. 3, the outlet 29 is opposed to the lamp power supply circuit 22 in this embodiment, and the cooling air flowing out from the outlet 29 is applied to the cooling of the lamp power supply circuit 22. The mounting position of the duct is located below the light source power supply circuit 22, and by the action of the air guide portion 29a, the cooling air flowing out from the blowout port 29 changes its direction to the direction of the lamp power supply circuit. Comes to flow.

Next, the fifth feature of the present invention will be described with reference to FIG. FIG. 12 is a plan view showing the same duct 19 as in FIG. A feature of the cooling unit of the present invention is that the sucked outside air is made to flow out from the six outlets. The flow is indicated by W _{1 to} W ₆ . The outlet 24 and the other outlets 27, 28 corresponding to RGB, respectively.
It is designed to blow out from 6 channels of 29. The outlet 27 is used for cooling the video / audio circuit (21 in FIG. 3), the outlet 28 for cooling the polarizing device 11, and 29 for cooling the lamp power supply circuit (22 in FIG. 3). The intake cooling fan unit according to the present invention includes a fan 4 and a cover 33 (not shown).
And the duct 19, and the structure allows the flow of the cooling air in the six flow paths.

Of the flow path, the cooling air W ₆ blown out from the air outlet 28 is used for cooling the polarizing device 11 as described above, but in this device, it is reused for cooling the light source. Regarding the flow of the cooling air W ₆ , FIG. 12 and FIG.
Will be described in detail. FIG. 13 is an EE cross section of FIG.
A separating / combining unit 36 having substantially the same shape as the duct 19 is also shown. Reference numeral 11 is the above-mentioned polarizing device, and 42 is a heat shield plate configured to sandwich the polarizing device from both sides. The heat shield plate 42 has a function of blocking the light reflected by the polarization device 11, and limits the temperature rise of the combined separation unit case 36a. Reference numeral 43 is a ventilation hole opened in the duct. The cooling air W ₆ passing through the air outlet 28 passes through the ventilation hole 43 and flows into the separating / combining unit 36 like cooling air W ₆₁ , W ₆₂ . Of these, the cooling air W ₆₁ flowing from the ventilation holes 43a is
The emission side 11a of the polarization device 11 in the separation / synthesis unit is cooled, and also flows into the gap between the heat shield plate 42 and the separation / synthesis unit case 36a. Thereafter the cooling air openings 36b of the separation synthesis unit, towards the light source exits as cooling air W _60.

On the other hand, the cooling air W _{62 which has} escaped from the ventilation hole 43b.
Cools the incident side 11b of the polarizing device, and moves toward the light source from the opening 36b like cooling air W ₆₀ . The cooling air W ₆ is used not only for cooling the polarizing device but also for cooling the light source that is the source of light.

Another embodiment of the present invention will be described with reference to FIG. FIG. 14 is a sectional view of the essential parts of the cooling fan unit of the present invention. In the case of this embodiment, the distribution guide plates 30 are doubled. As shown by the broken line, the cooling air generated by the cooling fan 4 is separated by the respective distribution guide plates and flows into the flow path formed by the condenser lens 6, the incident side polarization plate 2, the liquid crystal panel 3 and the like. By applying the distribution guide plate 30 corresponding to the number of components in the configured separation / synthesis unit, the cooling air is separated into the flow passages configured by the respective components, and predetermined cooling can be performed.

FIG. 15 shows another embodiment of the present invention. This is an example in which a part of the support frame 2a that supports the polarizing plate 2 is applied to the inside of the duct, and the distribution plan plate described above is applied. Similarly, in FIG. 15, the first guide plate 26 can be easily extended to the inside of the duct by a component (separation frame supporting frame 3a of the liquid crystal panel in the case of this embodiment) in the separation and synthesis.

[0035]

As described above, the projection type image display apparatus of the present invention has many effects because it has an efficient cooling fan unit. First, according to the first feature of the present invention, the liquid crystal panel and the polarizing plate corresponding to RGB can be cooled according to the respective heat generation amounts so as to maximize the capacity of the cooling fan. The amount of air coming out of each RGB outlet is determined by the positional relationship between the fan and the duct, the shape of the duct, the layout of the guide plate in the duct, etc., but after being determined by these design elements, the distribution at each outlet is This method can be easily set. Therefore, it is possible to make detailed consideration such as allocating a larger amount of air blown out from each outlet to a part having a large heat generation, and eliminating waste such as increasing the airflow of the cooling fan according to a part having a large heat generation.

According to the second feature of the present invention, it is sufficient to arrange the blow-out ports at the center of the cooling fan having a small air volume so that the positions of the blow-out ports of each RGB can be compactly arranged as a whole. We have devised a wind guide plate that can secure a large air volume. By arranging the air collecting destination of the air collecting guide plate at the portion where the air volume is the smallest, the air collecting amount can be easily taken in by the outer circumference of the cooling fan as well as the air collecting amount collected by the air collecting guide plate. I did it. As a result, the optical components in the separation / synthesis unit can be designed and arranged compactly regardless of the position of the blowout port.

According to the third feature of the present invention, the cooling air used for cooling the optical components corresponding to each RGB is recovered again by the recovery guide plate provided outside the separating / combining unit to cool other heat generating components. It was possible to prevent new installation of the cooling fan.

According to the fourth aspect of the present invention, since the direction of the cooling air blown from the duct can be changed,
Centralized cooling of the heat generating part has become easier. This can prevent the cooling fan from increasing in size.

According to the fifth feature of the present invention, the blow-out passages of the cooling fan unit are limited to six paths. By reusing the cooling air from each outlet, it is no longer necessary to provide more outlets than necessary.
This increases the static pressure in the duct of the cooling fan unit, and the momentum of the cooling air coming out of the outlet can be maintained. This means that a small cooling fan can provide effective cooling.

As described in detail above, in the projection type image display apparatus of the present invention, the size of the entire apparatus can be designed compactly and the cooling fan can be made small by efficiently applying the cooling air.
Not only can power consumption be saved, but a cooling fan with a small air volume can be applied, which is extremely advantageous for noise. The projection-type image display device of the present invention has a small size, low power consumption, and low noise, and thus has very high commercial value.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cooling fan unit showing an embodiment of a device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic configuration diagram of a projection type image display device showing an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a projection type image display device showing a conventional example.

FIG. 5 is a cross-sectional view of an enlarged main part of an R portion of FIG. 4 showing a conventional example.

FIG. 6 is an explanatory view of the principle of the cooling fan unit of the present invention.

FIG. 7 is an explanatory view of the principle of the cooling fan unit of the present invention.

FIG. 8 is a principle diagram showing a wind speed distribution of a cooling fan.

FIG. 9 is a plan view of a separation and synthesis unit showing another embodiment of the present invention.

FIG. 10 is a DD cross-sectional view of FIG. 3 showing another embodiment of the present invention.

FIG. 11 is a sectional view taken along the line CC of FIG. 1 showing another embodiment of the present invention.

FIG. 12 is a plan view of a duct portion of a cooling fan unit showing another embodiment of the present invention.

FIG. 13 is an EE sectional view of FIG. 12 showing another embodiment of the present invention.

FIG. 14 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 15 is a cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 16 is a cross-sectional view of an essential part showing another embodiment of the present invention.

[Explanation of symbols]

1 Light Source 11 Polarizer 12
Cold mirror 4 Cooling fan 24, 27, 28, 29 Blow-out port 26 First guide plate 30 Distribution guide plate 32
Wind collection guide plate 37 Collection guide plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location G03B 17/00 G03B 17/00 P 21/16 21/16 (72) Inventor Taishi Yamazaki Yokohama, Kanagawa Prefecture Hitachi Media Co., Ltd., 292 Yoshida-cho, Totsuka-ku, Japan (72) Inventor Takesuke Maruyama 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa

Claims (6)

[Claims] 1. A light source and a device for polarizing light from the light source,
Projection comprising a filter for cutting infrared rays or ultraviolet rays, a means for separating the three primary colors of light, a means for modulating the separated three primary colors of light and then combining them again, and a means for enlarging and projecting the light on a screen or the like. Image display device, having a liquid crystal panel whose temperature rises due to light energy emitted from a light source and a cooling fan unit for cooling the polarizing plate,
The cooling fan unit includes an intake cooling fan, a duct, and a cover, and at least a distribution guide plate that distributes a predetermined amount of air to the liquid crystal panel and the polarizing plate is provided at an outlet corresponding to RGB of the duct. One of
Thirdly, a projection type image display device characterized by being configured. 2. An RGB air outlet formed in a duct of a cooling fan unit, wherein an air collecting guide plate and a distribution guide plate are formed in the air outlet near the center of the fan. Projection type image display device. 3. The outlet of the cooling fan unit is RGB
The projection-type image display device according to claim 2, comprising 6 paths for a light source, a video / audio circuit, a polarizing device, and a light source power circuit. 4. The projection type image display device according to claim 2, wherein the cooling air passing through the blower for the polarizing device of the cooling fan unit flows into the light source cooling flow path. 5. The cooling fan unit including at least one of the other blow-out ports other than the RGB blow-out port is constituted by a wind guide section that changes the flow of wind. Projection image display device. 6. The cooling fan unit collects the wind blown out from the RGB outlets on the liquid crystal panel of each RGB, the polarizing plate, etc., and thereafter by the collection guide plate outside the separation / synthesis unit, and again. The projection type image display apparatus according to claim 2, wherein the projection type image display apparatus is used for cooling another heat source.