WO2016021032A1

WO2016021032A1 - Projecting display device

Info

Publication number: WO2016021032A1
Application number: PCT/JP2014/070948
Authority: WO
Inventors: 片山　猛; 勇人清水; 近藤　義広; 哲樹西村
Original assignee: 日立マクセル株式会社
Priority date: 2014-08-07
Filing date: 2014-08-07
Publication date: 2016-02-11

Abstract

A projecting display device, having a light source for emitting light, a polarizing plate (7) and a liquid crystal panel (6) for changing the intensity of the light emitted by the light source, a light synthesis prism (8) for synthesizing the light that has passed through the polarizing plate (7) and the liquid crystal panel (6), a projecting lens (9) disposed on the optical path of the light, and a duct (105) disposed so that air (73) strikes the light-passing surface (6a) of the liquid crystal panel (6) diagonally. An opening (103) of the duct (105) through which air (73) is blown out is formed in an oblong configuration along the lateral width of the liquid crystal panel (6).

Description

Projection display

The present invention relates to a projection display device, for example, a liquid crystal projection display device that projects an image on a screen using a liquid crystal panel.

In a projection display device, light from a light source is irradiated onto a liquid crystal panel, etc., and light intensity modulation (also referred to as spatial light modulation) that changes the intensity of light for each pixel is performed on the liquid crystal panel. There is a liquid crystal projection display device (hereinafter also referred to as a liquid crystal projector) that enlarges and projects the optical image onto a screen or the like.

This type of projection display device has a plurality of heat sources (for example, a light source lamp, a liquid crystal panel, a polarizing plate, a power source for driving the lamp, etc.) inside, and the heat generated from these heat sources causes optical Since the life of the parts is shortened, for example, the temperature of the liquid crystal panel needs to be 70 ° C. or lower.

In recent years, liquid crystal projectors are desired from the market to improve image quality by reducing the size of the housing and increasing the brightness of the light source. The downsizing of the casing causes an increase in heat generation density due to the heat generating components and a decrease in the amount of cooling air due to an increase in pressure loss, and the increase in brightness leads to an increase in temperature of the liquid crystal panel and the like due to an increase in light energy. Therefore, if sufficient cooling means is not used, the image quality is deteriorated. Therefore, it is essential to develop a cooling structure capable of improving the cooling efficiency in order to meet the market needs.

From such a background, cooling ducts for blowing air to heat generating parts such as liquid crystal panels and polarizing plates have been proposed. For example, the technique disclosed in Japanese Patent Application Laid-Open No. 2013-178416 (Patent Document 1) uses a liquid crystal panel to cool the surface of a liquid crystal panel or polarizing plate (hereinafter referred to as a liquid crystal panel or the like) of a projection display device. A nozzle type duct is inclined with respect to the other, and air is blown obliquely from this nozzle type duct.

JP 2013-178416 A

However, in the technique disclosed in Patent Document 1, air blown from a nozzle-type duct disposed obliquely with respect to the liquid crystal panel or the like hits another part of the liquid crystal panel and partially cools the liquid crystal panel or the like. The amount of heat released from the liquid crystal panel and the like is small, and it is difficult to improve the cooling efficiency of the entire liquid crystal panel and the like.

Also, since the duct tip is a nozzle type and a fan having high pressure is required, the cost of the fan is increased, and further problems such as increased fan noise occur.

An object of the present invention is to provide a technique capable of improving the performance of a projection display device.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.

The projection type display device of the present invention is combined with a light source, a polarizing plate and a substrate member that change the intensity of light emitted from the light source, and a light combining unit that combines light passing through the polarizing plate and the substrate member. And a fan that supplies air to at least one of the polarizing plate and the substrate member. Further, the air is guided to at least one of the polarizing plate and the substrate member, and a duct disposed obliquely with respect to the light passage surface of at least one of the polarizing plate and the substrate member is provided. The first opening for blowing out the air of the duct is formed elongated along the lateral width of the polarizing plate or the substrate member.

The projection type display device of the present invention is combined with a light source, a polarizing plate and a substrate member that change the intensity of light emitted from the light source, and a light combining unit that combines light passing through the polarizing plate and the substrate member. And a fan that supplies air to at least one of the polarizing plate and the substrate member. Further, the air is guided to at least one of the polarizing plate and the substrate member, and a duct disposed obliquely with respect to the light passage surface of at least one of the polarizing plate and the substrate member is provided. Have. Furthermore, the first opening for blowing out the air of the duct is formed to be elongated along the lateral width of the polarizing plate or the substrate member, and the air blown out of the duct is out of the polarizing plate and the substrate member. The duct is arranged so as to hit at least one of the light passage surfaces in the center in the height direction.

The projection type display device of the present invention is combined with a light source, a polarizing plate and a substrate member that change the intensity of light emitted from the light source, and a light combining unit that combines light passing through the polarizing plate and the substrate member. And a fan that supplies air to at least one of the polarizing plate and the substrate member. Furthermore, it has a duct for guiding the air to at least one of the polarizing plate and the substrate member. The polarizing plate or the substrate member has the air blown from the duct, It arrange | positions so that it may contact | abut diagonally with respect to the light passage surface of at least any one of the said board | substrate members.

Among the inventions disclosed in the present application, the effects obtained by typical ones will be briefly described as follows.

The performance and reliability of the projection display device can be improved.

It is a top view which shows an example of schematic structure of the projection optical system in the projection type display apparatus of Embodiment 1 of this invention. FIG. 2 is a perspective view showing an example of an internal structure in which the upper housing and the drive substrate are removed from the projection display device shown in FIG. 1. FIG. 2 is a perspective view showing an example of an internal structure in which an upper casing, a drive substrate, and a projection optical system are removed from the projection display device shown in FIG. 1. It is a top view which shows an example of a structure of the prism unit in the projection type display apparatus shown in FIG. It is a block diagram which shows the blowing state of the air by the nozzle type duct which this inventor performed comparative examination. It is a fragmentary perspective view which shows the blowing state of the air by the nozzle type duct which this inventor performed comparative examination. It is a block diagram which shows an example of the blowing state of the air by the duct provided in the projection type display apparatus shown in FIG. FIG. 8 is a partially enlarged perspective view showing an example of the structure near the tip of the duct shown in FIG. 7. It is a block diagram which shows the blowing state of the air by the duct of the modification of Embodiment 1 of this invention. It is a block diagram which shows the test method which confirms the effect at the time of using the duct of Embodiment 1 of this invention. It is a data figure which shows the result of the test shown in FIG. It is a block diagram which shows an example of the blowing state of the air by the duct of the projection type display apparatus of Embodiment 2 of this invention.

In the following embodiments, the description of the same or similar parts will not be repeated in principle unless particularly necessary.

Further, in the following embodiment, when it is necessary for the sake of convenience, the description will be divided into a plurality of sections or embodiments, but they are not irrelevant to each other unless otherwise specified. The other part or all of the modifications, details, supplementary explanations, and the like are related.

Also, in the following embodiments, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), particularly when clearly indicated and when clearly limited to a specific number in principle, etc. Except, it is not limited to the specific number, and it may be more or less than the specific number.

Further, in the following embodiments, the constituent elements (including element steps) are not necessarily indispensable unless otherwise specified and clearly considered essential in principle. Needless to say.

Further, in the following embodiments, regarding constituent elements and the like, when “consisting of A”, “consisting of A”, “having A”, and “including A” are specifically indicated that only those elements are included. It goes without saying that other elements are not excluded except in the case of such cases. Similarly, in the following embodiments, when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted. Further, even a plan view may be hatched for easy understanding of the drawing.

(Embodiment 1)
FIG. 1 is a plan view showing an example of a schematic structure of a projection optical system in the projection display apparatus according to Embodiment 1 of the present invention.

In the first embodiment, a liquid crystal projector 1 shown in FIG. 1 will be described as an example of a projection display device.

First, the projection optical system shown in FIG. 1 will be described. A liquid crystal projector (projection type display device) 1 aims to make the illuminance distribution of the light from the light source unit 3 and the light source unit 3 uniform and separate colors. The liquid crystal panel (substrate member, also referred to as a light valve) 6 (6R, 6G, 6B) is composed of an optical unit 4 and a prism unit 5. The prism unit 5 synthesizes the light image formed by each liquid crystal panel 6 (6R, 6G, 6B) by the light combining prism (light combining unit) 8 and projects it by the projection lens 9.

The light source unit 3 is configured to emit light emitted from a lamp (light source) 3a such as an ultra-high pressure mercury lamp, LED light, or laser light as a bundle of light (hereinafter referred to as a luminous flux), and further to emit ultraviolet rays. A lamp lens 3b for cutting is provided.

The light beam emitted from the lamp 3a passes through the pair of

multi-lens arrays

401 and 402, and is then converted into linearly polarized light whose vibration direction is a fixed direction by the polarization conversion element 403.

After that, the light beam having a constant polarization direction passing through the condenser lens 404 is reflected by the dichroic mirror 408, for example, R light (red band light), G light (green band light) and B light (blue band light). Light) is transmitted and separated into two colors of light, and G light and B light are separated into G light and B light by a dichroic mirror 409.

The lights separated into R light, G light, and B light respectively enter the prism unit 5. For example, the R light is reflected by the dichroic mirror 408, further reflected by the reflection mirror 405, and enters the prism unit 5 through the condenser lens 410. Of the G light and B light transmitted by the dichroic mirror 408, the G light is reflected by the dichroic mirror 409 and enters the prism unit 5 through the condenser lens 411. Further, the B light passes through the dichroic mirror 409, is collected by the first relay lens 413, is then reflected by the reflection mirror 406, and is collected by the second relay lens 414. Further, the light is reflected by the reflection mirror 407, then condensed by the condenser lens 412, and enters the prism unit 5.

The prism unit 5 includes an R light liquid crystal panel 6R, a G light liquid crystal panel 6G, and a B light liquid crystal panel 6B on the three adjacent surfaces of the light combining prism 8, and incident polarizing plates 7aR, 7aG, and 7aB, respectively. The projection lens 9 is mounted on the remaining surface of the light combining prism 8 which is disposed between the output polarizing plates 7bR, 7bG and 7bB. Each polarizing plate (7a, 7b) includes at least a polarizing film and a plate-like holding member (a glass substrate having a function of transmitting or reflecting light from the light source unit 3 as a light source) that holds the polarizing film. To do.

The R light, G light, and B light incident on the prism unit 5 pass through the incident-side polarizing plate 7a (RGB), the liquid crystal panel 6 (6R, 6G, 6B), and the outgoing-side polarizing plate 7b (RGB) of each color light. The intensity of the light emitted from the lamp 3a is changed. That is, the intensity of the light emitted from the lamp 3a is modulated by passing through the polarizing plates (7a, 7b) and the liquid crystal panel 6. Then, the modulated light is combined by the light combining prism 8, and then enters the projection lens 9 disposed on the optical path, and is further enlarged and projected by the projection lens 9 and displayed on a screen (not shown).

The incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6 absorb light that could not be transmitted or reflected and generate heat. Since these optical components have a low allowable temperature, they are cooled by cooling air 72 guided to the optical components through a ventilation duct (see FIG. 2) 71 using a panel cooling fan (fan) 70.

Moreover, the light source unit 3 becomes very hot when the electric power is converted into light by the lamp 3a. Therefore, the light source unit 3 is cooled using the cooling fan 10.

Next, a liquid crystal projector in which the projection optical system is mounted on a housing will be described with reference to FIGS. 2 is a perspective view showing an example of an internal structure in which the upper housing and the drive substrate are removed from the projection display device shown in FIG. 1, and FIG. 3 is a perspective view showing the upper housing, the drive substrate, and the projection in the projection display device shown in FIG. It is a perspective view which shows an example of the internal structure which removed the optical system.

As shown in FIGS. 2 and 3, the liquid crystal projector 1 receives power from the power supply unit 2, emits light from the light source unit 3, and enters the optical unit 4. The cooling fan 10 is disposed adjacent to the light source unit 3 and is disposed between the light source unit 3 and the power supply unit 2.

As shown in FIG. 2, the light incident on the optical unit 4 is finally enlarged by the projection lens 9 and projected onto a screen (not shown) as described above with reference to FIG.

A plurality of cooling fans may be used for cooling the prism unit 5. As shown in FIG. 3, for example, the B panel cooling fan 70a cools the optical component on the side where the B light is incident, and the RG panel cooling fan 70b cools the optical component on the side where the R light and G light are incident. ing.

Various configurations are conceivable. The optical component on which the B light and the G light are incident may be cooled by the B panel cooling fan 70a, or the optical component on which the R light is incident may be cooled by the RG panel cooling fan 70b. It is also possible to cool with separate fans.

The ventilation duct 71 shown in FIG. 2 takes in outside air from the ventilation duct intake port 71a using the panel cooling fan 70 installed in the interior shown in FIG. Air 72 taken in from the ventilation duct intake port 71a through the dust filter 11 passes through the ventilation duct 71 shown in FIG. 2, and enters the polarizing plate 7a (7aR, 7aG, 7aB) of the prism unit 5 shown in FIG. The exit side polarizing plate 7b (7bR, 7bG, 7bB) and the liquid crystal panel 6 (6R, 6G, 6B) are cooled.

Next, the prism unit 5 will be described with reference to FIG. FIG. 4 is a plan view showing an example of the configuration of the prism unit in the projection display device shown in FIG.

In the prism unit 5, the incident side polarizing plate 7 a (7 a R, 7 a G, 7 a B), the outgoing side polarizing plate 7 b (7 b R, 7 b G, 7 b B), and the liquid crystal panel 6 (6 R, 6 G, 6 B) are surrounded by the light combining prism 8. It is arranged for each of R light, G light, and B light. And the air 72 is supplied from the ventilation duct discharge port 71b (71bR, 71bG, 71bB) provided in the component lower part of the clearance gap between each component. The size of the ventilation duct discharge port 71b (71bR, 71bG, 71bB) is such that the incident side polarizing plate 7a (7aR, 7aG, 7aB), the outgoing side polarizing plate 7b (7bR, 7bG, 7bB), the liquid crystal panel 6 (6R, 6G, 6B) is determined in consideration of all temperature balances.

Next, the structure of a comparative example examined by the present inventor will be described with reference to FIG. FIG. 5 is a configuration diagram showing a state of blowing air by a nozzle-type duct that the present inventor has compared and examined.

Here, for easier understanding, the liquid crystal panel 6 for R light and B light and the

polarizing plates

7a and 7b are not shown, and only the cross section of the G optical path at the same position as the AA cross section of FIG. 4 is shown.

The incident side polarizing plate 7a and the outgoing side polarizing plate 7b are respectively an incident polarizing plate polarizing film 7aa having a polarizing action, an outgoing polarizing plate polarizing film 7ba, an incident polarizing plate glass substrate 7ab that supports these polarizing films, and an outgoing polarizing plate glass substrate 7bb. It is formed. The incident polarizing plate polarizing film 7aa and the outgoing polarizing plate polarizing film 7ba are made of an organic material such as a polarizing film or a vapor deposition film of a metal such as aluminum. Moreover, general inorganic alkali glass, crystal glass, sapphire glass, etc. are used for the incident polarizing glass substrate 7ab and the outgoing polarizing glass substrate 7bb.

The liquid crystal panel 6G is connected to the drive substrate 80 via a connection flexible substrate 81G.

The comparative example shown in FIG. 5 uses a nozzle duct 101, and the nozzle duct 101 is installed obliquely with respect to the incident-side polarizing plate 7 a, and air 73 is incident from the outlet 102 of the nozzle duct 101. The incident side polarizing plate 7a, which is an optical component, is cooled by spraying the side polarizing plate 7a from an oblique direction.

The nozzle-type duct 101 described here is formed so that the cross-sectional area at the outlet 102 at the tip thereof is narrower than the side cross-sectional area (the cross-sectional area on the base end side) of the inlet of the nozzle-type duct 101. It has been done. That is, the outlet 102 has a shape that is tapered (see FIG. 6 described later) in both the vertical direction and the horizontal direction. Accordingly, in the nozzle type duct 101, the air 73 blown out from the blowout opening 102 hits the incident side polarizing plate 7a and the like locally.

Next, a problem in the case where the air 73 exiting from the nozzle duct 101 is used as a cooling means for the incident side polarizing plate 7a with respect to the incident side polarizing plate 7a will be described with reference to FIG. FIG. 6 is a partial perspective view showing the air blowing state by the nozzle-type duct that the present inventor has compared and examined.

In the structure in which the air 73 exiting from the nozzle duct 101 arranged with respect to the liquid crystal panel 6 or the incident side polarizing plate 7a is used as a cooling means for the liquid crystal panel 6 or the incident side polarizing plate 7a, as shown in FIG. It has a nozzle duct 101 protruding into the space. Then, in addition to the air 72 that has flowed in parallel from the ventilation duct discharge port 71bG side to the incident side polarizing plate 7a, the air 73 from the nozzle duct 101 collides with the incident side polarizing plate 7a locally ( P part) was carried out to cool the parts.

In this case, the air 73 blown out from the nozzle duct 101 cools only a part of the surface of the incident-side polarizing plate 7a, so that the entire incident-side polarizing plate 7a cannot be cooled, and is partially cooled. There is a problem that the temperature of the incident-side polarizing plate 7a rises at a location around the.

Also, since the size of the outlet 102 of the nozzle-type duct 101 is small and the pressure loss of the duct flow path increases, a fan having a high pressure is required, which causes a problem that the cost of the fan increases.

Further, it is necessary to arrange the nozzle type duct 101 so as not to block the light passing through the liquid crystal panel 6, the incident side polarizing plate 7a and the outgoing side polarizing plate 7b. As a result, the incident side polarizing plate 7a and the nozzle type duct 101 are arranged. This causes a problem that the air 73 cannot be applied to the targeted portion of the incident-side polarizing plate 7a because the distance from the air outlet 102 provided in the screen is increased.

Therefore, in view of the structure in which the air 73 blown out from the nozzle duct 101 arranged with respect to the liquid crystal panel 6 or the polarizing plate is used as a cooling means for the liquid crystal panel 6 or the polarizing plate, the first embodiment that solves the above-described problem is provided. Characteristic portions of the liquid crystal projector 1 will be described with reference to FIGS.

FIG. 7 is a block diagram showing an example of a state of air blowing by a duct provided in the projection display device shown in FIG. 1, and FIG. 8 is a partially enlarged perspective view showing an example of the structure near the tip of the duct shown in FIG. is there.

The duct 105 shown in FIG. 7 guides the air 73 blown out from the opening (first opening) 103 to at least one of the polarizing plate 7 and the liquid crystal panel 6. The air 73 is disposed so as to be obliquely applied to at least one of the light passage surfaces.

Here, a case will be described in which the duct 105 is arranged so that the air 73 strikes the light passage surface 6a of the liquid crystal panel 6 from diagonally forward.

That is, the duct 105 is disposed obliquely with respect to the light passage surface 6 a of the liquid crystal panel 6. At this time, the installation angle θ of the duct 105 with respect to the light passage surface 6a is 0 ° <θ <90 °. The cooling efficiency is simply high when the air 73 is blown from the 90 ° direction (perpendicular to the light passage surface 6a), but the 90 ° direction overlaps the optical path and is difficult to arrange. is there. Therefore, it is preferable to arrange the duct 105 so that the angle is as close to 90 ° as possible.

The duct 105 is preferably disposed below the liquid crystal panel 6. This is because a passage for air 72 is provided below the liquid crystal panel 6 and the polarizing plate 7, and the arrangement of the components is not a great hindrance when considering the arrangement of the components of the optical components.

Further, as shown in FIG. 8, the duct 105 has an opening 103 for blowing out the air 73 formed elongated along the lateral width of the polarizing plate 7 or the liquid crystal panel 6.

That is, the opening 103 is formed elongated in a direction along the horizontal width direction S (horizontal direction) of the liquid crystal panel 6G shown in FIG. That is, the liquid crystal panel 6G is formed as a long and narrow rectangle in the direction along the horizontal direction S (horizontal direction).

In other words, as shown in FIG. 8, the duct 105 has a tapered shape in which the height direction (H) is smaller in the height direction (H) than the width direction (I) of the duct 105 toward the opening 103 at the tip. It is. That is, the opening 103 at the tip has a horizontally long shape and the duct 105 has a tapered shape (the rectangular width of the opening 103 is larger in the horizontal width 103b than in the vertical width 103a).

However, the elongated shape of the opening 103 is not limited to a rectangle, and may be an elongated shape such as an ellipse or a rhombus.

In the first embodiment, the shape of the opening 103 at the tip of the duct 105 disposed obliquely with respect to the irradiated object (for example, the light passage surface 6a of the liquid crystal panel 6) is an elongated shape along the horizontal direction. By doing so, the wind speed and directivity of the air 73 can be improved. Thereby, as shown in FIG. 7, the air 73 hitting the liquid crystal panel 6 or the polarizing plate 7 from the oblique direction flows along the surface of the liquid crystal panel 6 or the polarizing plate 7 so as to rub the surface, and as a result, The heat transfer performance (cooling efficiency) of the entire surface of the liquid crystal panel 6 and the polarizing plate 7 can be enhanced.

Therefore, it is possible to extend the life and increase the brightness of optical components such as the polarizing plate 7 and the liquid crystal panel 6. Furthermore, since it is not necessary to attach a fan having a high pressure, it is possible to prevent the cost of the fan from increasing.

As a result, the liquid crystal projector 1 can be reduced in noise and cost.

As described above, the performance of the liquid crystal projector 1 of the first embodiment can be improved.

The air 73 blown out from the opening 103 of the duct 105 diffuses before reaching the liquid crystal panel 6 or the polarizing plate 7, but the wind at the portion extending outside the lateral width of the liquid crystal panel 6 or the polarizing plate 7 It does not contribute to the cooling of the panel 6 or the polarizing plate 7 and is lost. Therefore, the lateral width 103b of the opening 103 of the duct 105 shown in FIG. 8 is desirably equal to or smaller than the lateral width of the cooling surface (for example, the light passage surface 6a) of the liquid crystal panel 6 or the polarizing plate 7.

Further, the diffusion method of the air 73 blown out from the opening 103 can be grasped by the velocity distribution of the air 73. The velocity distribution of the air 73 is such that the width 103b of the opening 103 is b, the distance from the opening 103 in the traveling direction of the air 73 is x, the average wind speed when the air 73 passes through the opening 103 is u0, When the distance from the center of the lateral width 103b of the opening 103 in the traveling direction and the vertical direction is y, the speed in the traveling direction of the air 73 is u, and the maximum speed in the traveling direction of the air 73 is umax, umax = 3.4 × {B / (2x)} × u0 and u / umax = exp {−57 × (y / x) × (y / x)}.

On the other hand, if the vertical width 103a of the opening 103 is too wide, the wind speed and directivity of the air 73 are lowered, and if it is too narrow, the cooling efficiency is lowered due to a reduction in the air volume of the air 73 and an increase in pressure loss. Therefore, it is desirable to determine an optimum dimension from the shape of the duct 105 and the air volume-static pressure characteristics of the fan.

Next, in the liquid crystal projector 1 according to the first embodiment, as shown in FIG. 7, the air 73 blown out from the opening 103 of the duct 105 is the center where the liquid crystal panel 6 (or the polarizing plate 7) generates the largest amount of heat. The duct 105 is arranged so as to hit the vicinity.

That is, the duct 105 is arranged so that the air 73 blown out from the opening 103 formed in an elongated shape hits the central portion in the height direction of the light passage surface 6a of the liquid crystal panel 6 (or the polarizing plate 7).

Here, the central portion in the height direction of the light passage surface 6a of the liquid crystal panel 6 is the center of three regions obtained by dividing the height into three equal parts in the height direction of the liquid crystal panel 6, as shown in FIG. (In FIG. 7, the region between T1 and T2). That is, the duct 105 is arranged so that the air 73 hits the region (center portion) between T1 and T2 of the light passage surface 6a of the liquid crystal panel 6.

Thereby, the air 73 can be applied to the central portion of the liquid crystal panel 6 (or the polarizing plate 7) in the height direction where the heat generation amount is the largest, and the cooling efficiency of the liquid crystal panel 6 (or the polarizing plate 7) can be increased. .

As a result, it is possible to extend the lifetime and increase the brightness of optical components such as the liquid crystal panel 6 and the polarizing plate 7. Thereby, since it is not necessary to attach the fan which has a high pressure, it can prevent that the cost of a fan increases.

As a result, the performance and reliability of the liquid crystal projector 1 can be improved, noise reduction and cost reduction can be achieved.

In the liquid crystal projector 1 according to the first embodiment, the duct 105 has a temperature relative to the incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6 for the R light, G light, and B light shown in FIG. It may be installed for parts that need to be reduced. That is, it may be used in combination with cooling by the parallel flow 75 from the ventilation duct discharge port 71bG shown in FIG. Specifically, if the nozzle type duct 101 shown in FIG. 5 is replaced with the duct 105 of the first embodiment, cooling using the duct 105 is employed only for cooling the light incident surface side of the incident side polarizing plate 7a, For the remaining parts, cooling by parallel flow 75 may be employed.

Next, a modification of the first embodiment will be described. FIG. 9 is a configuration diagram showing a state in which air is blown by a duct according to a modification of the first embodiment of the present invention.

In the modification shown in FIG. 9, the liquid crystal panel 6 or the polarized light is in a range from the root (base end portion) of the duct 105 disposed obliquely with respect to the light passage surface 6 a of the liquid crystal panel 6 to the opening 103 at the distal end portion. An opening (second opening) 104 is formed toward another liquid crystal panel 6 or another polarizing plate 7 provided at a position facing the plate 7 with a duct 105 interposed therebetween.

That is, the duct 105 shown in FIG. 9 is configured such that the air 74 hits another liquid crystal panel 6 or another polarizing plate 7 disposed at a position facing the liquid crystal panel 6 or the polarizing plate 7 with the duct 105 interposed therebetween. It has an opening 104 formed.

At that time, similarly to the opening 103, the opening 104 is formed to be elongated along the horizontal width (horizontal direction) of the liquid crystal panel 6 or the polarizing plate 7. That is, the opening 104 is also formed in an elongated shape such as a rectangle.

Thereby, in addition to the air 73 blown out from the opening 103 of the duct 105, the air 74 blown out from the opening 104 of the duct 105 is blown toward the other liquid crystal panel 6 or the other polarizing plate 7 disposed on the opposite side. The other liquid crystal panel 6 or the other polarizing plate 7 disposed on the opposite side can be cooled.

Thus, the other liquid crystal panel 6 and the other polarizing plate 7 can be cooled without adding a new duct separately from the duct 105 disposed obliquely with respect to the liquid crystal panel 6.

It should be noted that it is desirable that the horizontal and vertical widths of the opening 104 arranged toward the other liquid crystal panel 6 or the other polarizing plate 7 arranged facing each other are determined to be optimal dimensions as in the case of the opening 103.

Next, another modification of the first embodiment will be described. The duct 105 may be formed of a transparent material that transmits light. For example, acrylic, polycarbonate or glass.

As described above, since the duct 105 is formed of a transparent material that transmits light, the duct 105 can be disposed near the liquid crystal panel 6 and the polarizing plate 7. In this case, since the duct 105 allows light to pass, it does not significantly hinder the optical path.

Since the duct 105 can be disposed near the liquid crystal panel 6 and the polarizing plate 7, the air 73 can be applied to the liquid crystal panel 6 and the polarizing plate 7 without diffusing. Thereby, it can cool, without reducing the cooling efficiency of the liquid crystal panel 6 or the polarizing plate 7. FIG.

Next, a confirmation test of the effect when the duct according to the first embodiment is used will be described with reference to FIGS. 10 and 11. FIG. 10 is a block diagram showing a test method for confirming the effect when the duct of Embodiment 1 of the present invention is used, and FIG. 11 is a data diagram showing the results of the test shown in FIG.

In this test, as shown in FIG. 10, the temperature of the liquid crystal panel 6 is changed while changing the vertical width 103 a of the rectangular opening 103 of the duct 105 and the blowing height (target) of the air 73 to the liquid crystal panel 6. The temperature transition was confirmed for the highest part. In the test, the input power to the liquid crystal panel 6 and the supply conditions of the air 73 were the same. The distance between the opening 103 of the duct 105 and the collision portion (R portion) between the air 73 of the liquid crystal panel 6 is constant.

FIG. 11 shows the transition of the maximum temperature of the liquid crystal panel 6 when the vertical width 103a of the opening 103 of the duct 105 of FIG. 10 and the target height y of the air 73 blown to the liquid crystal panel 6 are changed. Yes.

According to FIG. 11, the maximum temperature of the liquid crystal panel 6 is changed by changing the vertical width 103 a of the opening 103 of the duct 105 and the target height y of the air 73 blown to the liquid crystal panel 6. I understand.

Specifically, when the vertical width 103a of the opening 103 of the duct 105 is 2 mm and the target height y of the air 73 blown to the liquid crystal panel 6 is 0 mm, the temperature of the liquid crystal panel 6 can be lowest. .

For this reason, the shape of the opening 103 of the duct 105 disposed obliquely with respect to the component surface is a long and narrow shape such as a rectangle, and the air 73 blown out from the opening 103 is high in the liquid crystal panel 6 or the polarizing plate 7. It has been found that the cooling efficiency of the liquid crystal panel 6 and the polarizing plate 7 can be improved by arranging the duct 105 so as to be in the vicinity of the center in the vertical direction (center portion).

It is preferable to arrange the duct 105 so that the air 73 blown out from the opening 103 of the duct 105 hits the central portion in the height direction of the liquid crystal panel 6 or the polarizing plate 7, but from the test results shown in FIG. It is most preferable to arrange the duct 105 so that 73 hits the center in the height direction of the liquid crystal panel 6 or the polarizing plate 7 (position where the height y is 0 mm).

(Embodiment 2)
FIG. 12 is a block diagram showing an example of the state of air blowing by the duct of the projection display device according to the second embodiment of the present invention.

A liquid crystal projector (projection display device) according to the second embodiment will be described. Here, for easier understanding, the polarizing plate and the liquid crystal panel on which R light and B light are incident are not shown, and only the cross section of the G optical path at the same position as the AA cross section in FIG. 4 is shown.

In the first embodiment described above, the air 73 is blown from the duct 105 disposed obliquely with respect to the incident side polarizing plate 7a, the outgoing side polarizing plate 7b, and the liquid crystal panel 6, and the incident side polarizing plate 7a and the outgoing side polarizing plate 7b. The case where the liquid crystal panel 6 is cooled has been described.

However, the arrangement interval of components such as the incident-side polarizing plate 7a, the outgoing-side polarizing plate 7b, and the liquid crystal panel 6 is narrowed, and a space for arranging the duct 105 cannot be secured. Moreover, since the pressure loss increases when the component interval is narrowed, the flow rate of the air 73 from the panel cooling fan 70 (see FIG. 1) is reduced, which may lead to a decrease in reliability due to a temperature rise. In order to cope with the increase in pressure loss, the number of rotations of the panel cooling fan 70 may be increased, but a problem arises in terms of noise.

Therefore, in the second embodiment, either one or both of the liquid crystal panel 6 and the polarizing plate 7 are disposed so as to be inclined with respect to the vertical direction, whereby the air 73 blown out from the duct 105 is transferred to the liquid crystal panel 6. And the surface of the polarizing plate 7 (for example, the light passage surface 6a of the liquid crystal panel 6) is obliquely applied. As a result, the cooling efficiency can be improved even when the interval between parts is narrow and the duct 105 cannot be disposed obliquely.

At this time, the cooling efficiency can be improved by optimizing the surface of the liquid crystal panel 6 and the polarizing plate 7, the relative positional relationship of the duct 105, and the opening 103 (see FIG. 8) as in the first embodiment. it can.

Further, since the cooling efficiency of the optical components such as the liquid crystal panel 6 and the polarizing plate 7 can be improved, the lifetime of these optical components and the increase in luminance can be achieved as in the first embodiment. Furthermore, since it is not necessary to attach a fan having a high pressure, it is possible to prevent the cost of the fan from increasing.

As a result, the performance and reliability of the liquid crystal projector can be improved, and the noise and cost can be reduced.

Note that either one or both of the liquid crystal panel 6 and the polarizing plate 7 are disposed so as to be inclined with respect to the vertical direction, and the duct 105 is not disposed obliquely with respect to the inclined liquid crystal panel 6 and the polarizing plate 7. Alternatively, one or both of the liquid crystal panel 6 and the polarizing plate 7 may be inclined with respect to the vertical direction, and the duct 105 may be further inclined with respect to the inclined liquid crystal panel 6 and polarizing plate 7. May be arranged diagonally.

As described above, the first embodiment has described the duct configuration for improving the cooling efficiency of the optical component by the duct 105 disposed obliquely with respect to the liquid crystal panel 6 or the polarizing plate 7. In the second embodiment, the configuration in which one or both of the liquid crystal panel 6 and the polarizing plate 7 are inclined with respect to the vertical direction, thereby improving the cooling efficiency of the optical component has been described. Is.

Further, the invention made by the present inventor has been specifically described based on the embodiments of the invention. However, the present invention is not limited to the embodiments of the invention, and various modifications can be made without departing from the scope of the invention. It goes without saying that it is possible.

Note that the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.

Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. In addition, each member and relative size which were described in drawing are simplified and idealized in order to demonstrate this invention clearly, and it becomes a more complicated shape on mounting.

1 Liquid crystal projector (projection display)
3a lamp (light source)
4 Optical unit 6 Liquid crystal panel (substrate member)
6a Light passing surface 7 Polarizing plate 7a Incident side polarizing plate 7b Outgoing side polarizing plate 8 Photosynthesis prism (photosynthesis unit)
9 Projection lens 70 Panel cooling fan (fan)
72, 73, 74, air 103 opening (first opening)
104 opening (second opening)
105 duct

Claims

A light source that emits light;
A polarizing plate and a substrate member for changing the intensity of light emitted from the light source;
A photosynthesis unit for synthesizing light that has passed through the polarizing plate and the substrate member;
A projection lens disposed on the optical path of the light combined by the light combining unit;
A fan for supplying air to at least one of the polarizing plate and the substrate member;
The air is guided to at least one of the polarizing plate and the substrate member, and a duct disposed obliquely with respect to the light passage surface of at least one of the polarizing plate and the substrate member;
Have
The projection type display device, wherein the first opening for blowing out the air of the duct is formed to be elongated along the lateral width of the polarizing plate or the substrate member.
A light source that emits light;
A polarizing plate and a substrate member for changing the intensity of light emitted from the light source;
A photosynthesis unit for synthesizing light that has passed through the polarizing plate and the substrate member;
A projection lens disposed on the optical path of the light combined by the light combining unit;
A fan for supplying air to at least one of the polarizing plate and the substrate member;
The air is guided to at least one of the polarizing plate and the substrate member, and a duct disposed obliquely with respect to the light passage surface of at least one of the polarizing plate and the substrate member;
Have
The first opening for blowing out the air of the duct is formed elongated along the lateral width of the polarizing plate or the substrate member,
The projection display device, wherein the duct is arranged so that the air blown out from the duct hits a central portion in a height direction of the light passage surface of at least one of the polarizing plate and the substrate member. .
In the projection type display device according to claim 1 or 2,
The duct has a second opening formed so that the air hits another polarizing plate or another substrate member disposed at a position facing the polarizing plate or the substrate member with the duct interposed therebetween. And
The projection display device, wherein the second opening is formed to be elongated along the lateral width of the polarizing plate or the substrate member.
In the projection type display device according to claim 1, 2, or 3,
The projection display device according to claim 1, wherein the duct has a tapered shape in which a ratio in which a size in a height direction becomes smaller as compared with a width direction of the duct is increased toward the first opening at a tip thereof.
A light source that emits light;
A polarizing plate and a substrate member for changing the intensity of light emitted from the light source;
A photosynthesis unit for synthesizing light that has passed through the polarizing plate and the substrate member;
A projection lens disposed on the optical path of the light combined by the light combining unit;
A fan for supplying air to at least one of the polarizing plate and the substrate member;
A duct for guiding the air to at least one of the polarizing plate and the substrate member;
Have
The projection type in which the polarizing plate or the substrate member is disposed so that the air blown out from the duct is obliquely applied to a light passage surface of at least one of the polarizing plate and the substrate member. Display device.
In the projection type display device according to claim 5,
The duct is a projection type display device in which a first opening for blowing out the air is formed to be elongated along the lateral width of the polarizing plate or the substrate member.
In the projection type display device according to claim 6,
The projection display device, wherein the duct is arranged so that the air blown out from the duct hits a central portion in a height direction of the light passage surface of at least one of the polarizing plate and the substrate member. .
In the projection type display device according to claim 5, 6 or 7,
The duct has a second opening formed so that the air hits another polarizing plate or another substrate member disposed at a position facing the polarizing plate or the substrate member with the duct interposed therebetween. And
The projection display device, wherein the second opening is formed to be elongated along the lateral width of the polarizing plate or the substrate member.
The projection display device according to any one of claims 1 to 8,
The said duct is a projection type display apparatus formed of the material which lets light pass.
The projection display device according to any one of claims 1 to 9,
The projection display device, wherein the substrate member is a liquid crystal panel.
The projection display device according to any one of claims 1 to 10,
The light combining unit is a projection display device that is a light combining prism.