JP3478202B2 - Projection type image display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type 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 structure thereof.

[0002]

2. Description of the Related Art A conventional projection type image display device is shown in FIG.
And FIG. 5 will be described. 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.
And a reflection system 10 for decomposing the light L into R, G, B components LR, LG, LB, and three liquid crystal panels 3R into which only one component of the RGB components LR, LG, LB is incident. ,
A magnifying projection lens system 20 that magnifies and projects the respective components LR, LG, and LB that have passed through 3G and 3B onto a screen (not shown), and a cooling fan 4 that cools the liquid crystal panels 3R, 3G, and 3B, and these. It has a cabinet 5 for storing.

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, a fourth dichroic mirror 114 that passes only the components LR and LB, and all incident light. The first to third total reflection mirrors 101 to 103 for reflecting the component of 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. The first dichroic mirror 1 is attached to the liquid crystal panel 3R on which an image corresponding to the component LR is displayed.
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 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. Further, the component LG that has passed through the liquid crystal panel 3G is incident on the fourth dichroic mirror 114 via the third total reflection mirror 103. Since the components LR and LB incident on the third dichroic mirror 113 are also incident on the fourth dichroic mirror 114, the components LR, LG and LB on the fourth dichroic mirror 114 are also incident.
Are superimposed and projected on the screen via 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]

In the present invention, from the light source side
Light is incident on the polarizing plate and the liquid crystal panel to display an image.
In the projection image display device, the liquid crystal panel and the polarization
Cooling from the cooling fan by arranging the light plate and the light plate apart from each other
An air passage is formed to guide the wind toward the liquid crystal panel and the polarizing plate.
A first guide plate formed in the air passage, the first guide plate
The liquid crystal panel which distributes the cooling air guided by a predetermined amount
And a second guide plate for supplying to each of the polarizing plates.
Or the liquid crystal panel and the bias.
Cooling from the cooling fan by arranging the light plate and the light plate apart from each other
First plan to guide the wind toward the liquid crystal panel and the polarizing plate
Blow-out of cooling air guided by the inner plate and the first guide plate
A part of the cooling air directed to the liquid crystal panel is deflected to the outlet.
A second guide plate is provided to face the light plate, and the second guide plate is provided.
The cooling air guided by the first guide plate by the guide plate
Of the liquid crystal panel and the polarizing plate, respectively.
Configure to supply it.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described by the following description of each means technique.

The first means relates to a method for efficiently cooling the liquid crystal panel and the 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.

[0012] The second means is that, among RGB, a wind guide plate is formed at the outlet 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.

The third means is a recovery guide plate for recovering the cooling air that has passed through the liquid crystal panel and the polarizing plate, and is a second RGB
It is configured in the outlet of.

The fourth means is to construct an air guide section for changing the direction of the cooling air in any other blow section except the RGB blow openings.

The fifth means is to limit the number of outlets of the cooling fan unit consisting of the cooling fan and the duct to six for RGB, for the video / audio circuit, for the lamp power supply and for the polarizing device.

In the above-mentioned first means, the distribution guide plates are arranged in two stages so as to oppose the rotation direction of the fan and the heights thereof are changed. Therefore, the cooling air blown on the guide plates changes its direction. , Is distributed to the cooling air of the liquid crystal panel and the polarizing plate, and is 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 is to collect the cooling air of 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 blowing port. It is designed to be collected in parts.

The third means is such that the recovery guide plate is formed between the second outlet of the polarization combining unit and the shield case forming the outside thereof, so that the polarization combining unit, the shield case and the recovery guide are provided. The cooling air gathers again in the area surrounded by the plates 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 flowing out from the blow-out port to one direction, so that the heat-generating portion can be centrally cooled and the heat radiation effect is large.

In the fifth means, the number of outlets is limited to 6, so that the cooling air from the cooling fan unit can be used efficiently.

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure of the entire apparatus 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. Reference numeral 1 is a light source of a metal halide lamp, 11 is a polarizing device, 12 is a cold filter, 13, 14, 15 and 16 are separate or combined dichroic mirrors, and 17 and 18 are total reflection mirrors. RGB liquid crystal panels 3R, 3G, 3 corresponding to the three primary colors of light
B and the incident side polarization plates 2R, 2G, and 2B are each configured in a predetermined manner. 20 is a projection lens. Four
Is a cooling fan for intake air, 19 is a duct, and these two parts are referred to as a cooling fan unit for intake air. 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. Reference numeral 38 denotes a shield case of this device. Note that FIG. 3 is a configuration diagram viewed from the back side of the apparatus, that is, the side where the cooling fan is present, and on the opposite side of the duct 19, a separating / combining unit of 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 on 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 means and its features of the intake cooling fan unit of the apparatus of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view detailing the duct 19 of the cooling fan unit of FIG. FIG. 2 is A- of FIG.
FIG. In FIG. 1 and FIG. 2, a first guide plate 26 is continuously formed at the RGB outlet 24 so as to oppose the rotation direction 25 of the cooling fan 4.
The height of the first guide plate is determined by the ribs 19 forming the duct 19.
It has the same height as a. A second guide plate 30 (distribution guide plate) is formed in the B outlet 24B in parallel with the first guide 26. The height of the distribution guide plate 30 is
It is set lower than the first guide plate. Reference numeral 31 is a partition inside the duct. Reference numeral 32 is a wind collecting guide plate. The partition 3
The height of 1 and the air collecting guide plate 32 is provided at the same height as the rib 19a. Reference numeral 33 is a cover provided with a hole 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 blown out of the unit through the RGB outlets 24 and the six flow passages 27, 28 and 29.

In the cooling fan unit having the above structure,
The first guide plate 26 has a function of collecting the cooling air W blown by the cooling fan 4 as indicated by broken lines W _{1 to} W ₃ in FIG. However, in the case of only the guide plate 26, the collected cooling air W is strongest just below the first guide plate, and becomes weaker away from this. In particular, this tendency appears as a remarkable phenomenon at the outlet 24B formed near the center of the cooling fan 4. Therefore, the wind speed of the liquid crystal panel 3B located immediately below the guide plate 26 can be sufficiently high, but the cooling air of the polarizing plate 2B away from this is not sufficient.

Therefore, when the distribution guide plate 30 is arranged at the outlet 24B, a new cooling air W ₀ is obtained from the distribution guide plate 30 as shown in FIG. The cooling efficiency of 2B is improved. The relationship is shown in FIG.
It is shown in FIG. 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 toward the outlet 24B, but the wind velocity distribution at the outlet opening is as shown in FIG. The wind speed just below is the strongest.

FIG. 7 shows the first guide plate 26 and the distribution guide plate 3.
This is the wind velocity distribution when both 0 are provided. As shown in FIG. 7, due to the action of the distribution guide plate 30, a strong wind speed W ₀ is newly obtained just below the distribution guide plate. Therefore, cooling of the polarizing plate disposed under the distribution guide plate 30 is promoted, and both the liquid crystal panel and the polarizing plate can be efficiently cooled. Figure 7
The magnitude of the wind speed immediately below the first guide plate 26 and the wind speed immediately below the distribution guide plate 30 can be set by the height h of the distribution guide plate.

In this embodiment, the case where the distribution guide plate is used only for the blowout ports of the B part of RGB has been shown, but it goes without saying that it can be applied to the blowout ports other than the B part if the distribution is required. . Incidentally, 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, the RGB outlets are arranged within the projected area of the cooling fan 4 as much as possible in order to reduce the size of the entire device. For this reason, of the cooling air blown into RGB, the air volume of the portion B near the center of the fan decreases. FIG. 8 shows an example of the measurement result of the wind velocity distribution of the cooling air emitted from the cooling fan. As shown in FIG. 8, in the axial fan, because of the motor 4a located at the center of the fan,
The wind speed at the center is low.

The feature of the second means lies 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 .

The third means and its features will be described with reference to FIGS. 9 and 10. 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 necessary to explain the third feature are shown respectively. In FIG. 9 and FIG. 10, on the upper surface of the separation / combination unit 36, second outlets 35 are formed corresponding to RGB. A recovery guide plate 37 is formed on the separation / synthesis unit 36 so as to surround the second outlet 35. 38 is a shield case for noise reduction, and 39 is a semiconductor formed on the lamp power supply circuit 22.

In FIG. 10, the cooling air W blown out 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. Then, the separation / synthesis unit 3 is discharged from the second outlet 35B.
Flows out of 6. The cooling air that has flowed out flows into the gap 40 surrounded by the shield case 38 and the recovery guide plate 37,
It acts to remove heat from the heat sink 41 that is integrally formed with the semiconductor 39 of the lamp power supply circuit.

The feature of the third means is that the cooling air used for cooling is collected and used 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. The recovery guide plate 37 forms a gap 40 between the shield case 38 and the separation / combination unit 36, and the second blowout port 35
Forms a flow path for the cooling air coming out of the shield case 3
The third feature can be achieved even if the cover is integrated with the recovery guide plate 37 and the flow path is independently formed without forming 8 as a part of the flow path.

Next, the fourth means and its features 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. The outlet 29 is, as shown in FIG.
In this embodiment, it opposes the lamp power supply circuit 22, and the cooling air flowing out from the outlet 29 is the lamp power supply circuit 22.
It is applied to cooling. The attachment position of the duct is located below the light source power supply circuit 22, and the air guide portion 29a is provided.
By the action of, the cooling air flowing out from the outlet 29 is
By changing its direction, the electric current flows in the direction of the lamp power supply circuit.

Next, the fifth means and its features will be described with reference to FIG. 12 shows the same duct 19 as in FIG.
FIG. The features of the cooling unit of the present invention are:
The intake air is made to flow out from six outlets. The flow is indicated by W _{1 to} W ₆ . Each R
The outlet 24 corresponding to GB and the other outlet 27,
It is designed to blow out from 6 channels of 28 and 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 of the present invention is composed of a fan 4, a cover 33, and a duct 19 (not shown), which allows the flow of the cooling air in the six flow paths.

Of the flow path, the cooling air W ₆ discharged from the outlet 28 is used to cool the polarizing device 11 as described above, but in this device it is also used to cool the light source.
The flow of the cooling air W ₆ will be described in detail with reference to FIGS. 12 and 13. 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 the effect of blocking the light reflected by the polarization device 11,
The temperature rise of the synthetic separation unit case 36a is limited.
Reference numeral 43 is a ventilation hole opened in the duct. Outlet 2
The cooling air W ₆ passing through 8 passes through the air holes 43 and flows into the separating / combining unit 36 like the cooling air W ₆₁ , W ₆₂ . Of these, the cooling air W ₆₁ flowing from the ventilation hole 43a cools the emission side 11a of the polarization apparatus 11 in the separation / synthesis unit, 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 that has} escaped from the ventilation holes 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.

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. The cooling air generated by the cooling fan 4 is separated by the respective distribution guide plates as shown by the broken line,
It flows in 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 still another embodiment of the present invention. This is an example in which the distribution guide plate described above is applied by extending a part of the support frame 2a supporting the polarizing plate 2 into the duct.
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.

From the first means, it is possible to cool the liquid crystal panel, the polarizing plate and the like corresponding to RGB in accordance with the respective heat generation amounts. The amount of air emitted from each RGB outlet can be adjusted by the positional relationship between the fan and the duct, the shape of the duct, the arrangement of the guide plate in the duct, and the like. Further, the distribution of the air volume at each air outlet can be easily set according to the amount of heat generated by the heat generating portion. Therefore, waste of the air volume of the cooling fan can be eliminated.

From the second means, the positions of the blowout ports of each RGB can be arranged compactly as a whole. Even a cooling fan with a small air volume can secure a sufficient air volume. In addition to taking in the amount of air collected by the wind collecting guide plate, it is also easy to take in the amount of air collected around the cooling fan. As a result, the optical components in the separation / combination unit can be compactly arranged regardless of the position of the outlet.

From the third means, the cooling air used for cooling the optical components corresponding to each RGB is recovered again by the recovery guide plate provided outside the separation / synthesis unit and used for cooling the other heat generating components. No new installation of cooling fan is required.

Since the direction of the cooling air blown from the duct can be changed from the fourth means, concentrated cooling to the heat generating portion can be easily performed. This can prevent the cooling fan from increasing in size.

From the fifth means, it is not necessary to provide more than necessary blow-out ports because the cooling air coming out from each blow-out port can be reused. This increases the static pressure in the duct of the cooling fan unit, can maintain the momentum of the cooling air coming out of the outlet, and can effectively cool even a small cooling fan.

[0044]

As described above, according to the present invention, a liquid crystal panel, a polarizing plate and the like corresponding to RGB can be cooled according to the respective heat generation amounts, and the distribution of the air flow can be set easily. it can. Therefore, it is possible to eliminate waste of the air volume of the cooling fan, easily perform concentrated cooling on the heat generating portion, and downsize the cooling fan. Further, the arrangement of the optical components in the separation / synthesis unit can be made compact.

That is, according to the present invention, it is possible to realize a projection type image display device which is small in size, low in power consumption, low in noise and extremely high in commercial property.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cooling fan unit showing an embodiment of the 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 an enlarged main part sectional view of an R portion of FIG. 4 showing a conventional example.

FIG. 6 is a diagram illustrating the principle of the cooling fan unit of the present invention.

FIG. 7 is a diagram illustrating 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 separating / combining unit showing another embodiment of the present invention.

FIG. 10 is a cross-sectional view taken along the DD line in 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 a sectional view taken along the line EE in FIG. 12, showing another embodiment of the present invention.

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

FIG. 15 is a cross-sectional view of essential parts 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 ... Blowout port, 26 ... a first guide plate, 30 ... Distribution guide plate, 32 ... Wind guide plate, 37 ... Collection guide plate.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G03B 21/16 G03B 21/16 H04N 5/74 H04N 5/74 Z 9/31 9/31 E (72) Inventor Taishi Yamazaki Kanagawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Ltd. Inside Hitachi, Ltd. visual media research institute (72) Inventor Takesuke Maruyama 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Pref. Inside Hitachi, Ltd. visual media research (56) References JP-A-8-234155 (JP, A) JP-A-4-271334 (JP, A) JP-A-4-236587 (JP, A) JP-A-1-289912 (JP, A) International Publication 92/15041 ( WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 21/16 G09F 9/00

Claims (4)

(57) [Claims] 1. A projection type image display device for displaying an image by making light from a light source side incident on a polarizing plate and a liquid crystal panel, wherein the liquid crystal panel and the polarizing plate are arranged apart from each other, and a cooling fan is provided. A first guide plate forming an air passage that guides cooling air in the direction of the liquid crystal panel and the polarizing plate, and a predetermined amount of cooling air introduced by the first guide plate is distributed in the air passage. And a second guide plate that supplies the liquid crystal panel and the polarizing plate, respectively. 2. A projection type image display device for displaying an image by making light from a light source side incident on a polarizing plate and a liquid crystal panel, wherein the liquid crystal panel and the polarizing plate are arranged apart from each other, and a cooling fan is provided. A first guide plate that guides cooling air in the direction of the liquid crystal panel and the polarizing plate, and a cooling air outlet that is guided by the first guide plate,
A second guide plate is provided for directing a part of the cooling air flowing toward the liquid crystal panel toward the polarizing plate, and the second guide plate causes a predetermined amount of the cooling air guided by the first guiding plate. A projection-type image display device, characterized in that it is distributed to the liquid crystal panel and the polarizing plate. 3. A polarizing plate and a liquid crystal panel are provided with a collection guide plate that collects the air that has cooled, and at least the lamp power supply circuit is cooled by the collected air. The projection-type image display device according to claim 2. 4. The projection type display according to claim 1, wherein the distribution guide plate is provided on at least one of a liquid crystal panel and a polarizing plate corresponding to R, G, and B. Image display device.