JP2004333757A - Light source device and projection display device using the same - Google Patents

Abstract

An object of the present invention is to provide a small and high-luminance light source device suitable for a small projection display device.
The device includes a mounting substrate, an LED chip disposed on the mounting substrate, and a sealed container filled with a liquid, wherein the LED chip is directly cooled by the liquid, and the sealed container is cooled. Is configured to transmit light from the LED chip 10.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device, and more particularly to a small, high-brightness light source device suitable for a small projection display device.
[0002]
[Prior art]
The projection display device includes a light source, a light modulation element such as a liquid crystal panel or a digital micromirror device (DMD) that modulates light emitted from the light source based on an image signal, and a projection lens that projects the modulated light. Having.
[0003]
In recent years, projection type display devices have been reduced in size, increased in brightness, prolonged in life, and reduced in cost. For example, for miniaturization, the size of a liquid crystal panel (light modulation element) is 1.3 inches on a diagonal of 0.5 inches, and the area ratio is reduced to just over 1/6.
[0004]
On the other hand, as the light source, for example, a discharge lamp such as a metal halide lamp, an ultra-high pressure mercury lamp, and a halogen lamp is generally used, and these are also being reduced in size and increased in brightness. Originally, these light sources generate heat when emitting light, so there is a problem that the characteristics of the light sources themselves change, and there is a problem that heat propagates to the liquid crystal panel and optical components and becomes high temperature and deteriorates. Means and heat dissipation means are taken. However, as the size of the light source lamp is reduced and the brightness is increased, the heat generated from the light source is increasing more and more, and it is becoming difficult to take measures against the heat generated by the generally employed forced air cooling method using a fan. Therefore, a method of forcibly cooling a light source lamp using a liquid (for example, see Patent Document 1) has been proposed. According to the liquid cooling method, it is expected that the effect of eliminating the noise of the forced air cooling method is also obtained.
[0005]
[Patent Document 1]
JP 2002-107825 A
[0006]
[Problems to be solved by the invention]
However, in Patent Document 1, a heat collecting member is provided in a high-pressure mercury lamp as a light source, and the heat of the light source is absorbed into the liquid via the heat collecting member and cooled. That is, the heat of the light source is indirectly cooled, which is not sufficient in terms of cooling efficiency. On the other hand, discharge lamps have other problems to be improved other than heat. For example, the lamps and power supplies are large and heavy, and instantaneous lighting / extinguishing is not possible. Therefore, there is a need for improvement in terms of miniaturization and performance improvement of the projection display device.
[0007]
As a means for solving the above problems of the discharge type light source lamp, an LED light source has been proposed. The LED light source has advantages as a light source for a projection display device, such as being small in size including a power supply, capable of being turned on / off instantaneously, and having a wide color reproducibility and a long life. Further, since it does not contain harmful substances such as mercury, it is preferable from the viewpoint of environmental protection.
[0008]
However, in order to use an LED light source as a light source for a projection display device, the brightness of the light source is insufficient, and it is necessary to secure at least the brightness of a discharge type light source lamp. For that purpose, it is necessary to solve the following problems.
(1) High output
(2) Low etendue
[0009]
SUMMARY An advantage of some aspects of the invention is to provide a small and high-luminance light source device suitable for a small projection display device.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a light source device of the present invention includes a mounting substrate, an LED chip disposed on the mounting substrate, and a sealed container filled with liquid, wherein the LED chip is directly It is characterized in that it is cooled and at least a part of the sealed container is configured to transmit light from the LED chip.
[0011]
In current LEDs, the external quantum efficiency is low and most of the injected electrical energy is converted as heat. For this reason, the more the current is applied to the LED chip, the more the light emission increases. On the other hand, the amount of heat generated also increases significantly, so that the LED chip temperature rises and the light emission efficiency decreases. Since it was thermally destroyed, it was not possible to pass too much current. As a result, as the light source for the projection type display device, the current LED has an insufficient amount of emitted light.
[0012]
According to the present invention, since the LED chip is directly cooled by the liquid, the heat generated in the LED chip is exchanged with heat very efficiently, and as a result, the power input to the LED can be greatly increased. The amount of light emitted from the LED can be dramatically increased.
[0013]
In the light source device of the present invention, it is preferable that the non-emission light surface side of the light from the LED chip is directly cooled. According to this, the cooling of the LED chip with the liquid is performed only on the non-emission light surface side of the LED chip, and the cooling liquid does not hinder the emitted light on the emission light surface side, so that the effect of direct cooling is significantly impaired. Instead, it is possible to prevent the image quality from deteriorating due to the fluctuation of the liquid.
[0014]
In the light source device of the present invention, it is preferable that the sealed container is provided with a cooling unit for cooling the filled liquid. According to this, the temperature of the liquid that rises due to heat absorption from the LED chip can always be kept at an appropriate liquid temperature by using the cooling means, and the cooling ability of the liquid to the LED chip can be maintained for a long time.
[0015]
In the light source device of the present invention, it is preferable that the sealed container is provided with a circulating unit for circulating the filled liquid. According to this, the cooling liquid always flows to the heat generating portion of the LED chip by the circulation means, and heat is continuously transferred to the liquid. This makes it possible to more stably maintain the cooling capability of the liquid for the LED chips.
[0016]
In the light source device of the present invention, it is preferable that a plurality of the LED chips are stacked. In the projection type display device, in order to make the most of the light of the light source, the etendue of the light source must be equal to or preferably equal to or smaller than the etendue of the light modulation element. Here, the etendue is a numerical value that represents a spatial spread of a light beam that can be effectively used as a product of an area and a solid angle, and is optically stored. As described above, since the size of the liquid crystal panel (light modulation element) has been reduced, the etendue of the liquid crystal panel has been reduced. Therefore, by similarly reducing the etendue of the light source, the projection display device can be downsized and a bright display can be obtained.
[0017]
According to the present invention, the etendue of the light source can be reduced by stacking LED chips. For example, an LED chip is divided into four parts to reduce the area per one piece (emission light area = light source etendue area) to one fourth, and the number of stacked layers is four, and one LED chip is used without being divided. Compared to the case, the emitted light amount is almost the same in both cases.However, in the former method, the value depends on the LED chip size, thickness, the interval between the chips, etc., but the etendue of the light source can be considerably reduced. Thus, the light from the LED chip can be more effectively used as compared with the latter method. On the other hand, when a plurality of LED chips having the same area are stacked, the emission light amount is increased by almost the number of stacked layers without increasing the apparent LED surface area much more than when one LED is used (without increasing the light source etendue). It is possible to do.
[0018]
In the light source device of the present invention, a plurality of the LED chips are stacked so as to be separated from each other, and the separated portions are filled with the liquid and each of the LED chips is directly cooled. Is preferred. According to this, each stacked LED chip comes into direct contact with the cooling liquid, and the cooling efficiency is improved. As a result, the power applied to each LED chip can be increased, and the amount of emitted light can be further increased.
[0019]
The projection display device of the present invention includes the light source device of the present invention, a light modulation element that modulates light from the light source device, and a projection lens that projects modulated light from the light modulation element. And According to this, the light source device of the present invention includes a mounting substrate, an LED chip disposed on the mounting substrate, and a sealed container filled with liquid, wherein the LED chip is directly cooled by the liquid, At least a part of the sealed container is configured to transmit light from the LED chip. Thus, extremely high-intensity light is emitted from the small light source. The emitted light is effectively taken into the light modulation element because the light source etendue is appropriate, and the modulated light is projected as a bright image on the screen by the projection lens. As a result, a small, high-brightness projection display device can be obtained.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
The first embodiment relates to a light source device and will be described with reference to FIGS.
FIG. 1 is a schematic perspective view of a light source device 110 according to the present embodiment. FIG. 2 is a cross-sectional view of the light source device 110 of FIG. FIG. 3 is a plan view (a) and a cross-sectional view (b) of the LED chip 10 and the mounting board 20 that constitute the light source device 110 of FIG.
[0021]
As shown in FIG. 1, the light source device 110 of the present embodiment includes an LED chip 10, a mounting substrate 20, a sealed container 30, a transparent window 40, and cooling fins 50. As shown in FIG. 2, the liquid 90 is filled in the sealed container 30, and the LED chip 10 and the mounting substrate 20 are entirely immersed in the liquid 90. As shown in FIG. 3, the LED chip 10 includes an LED light emitting area 11 and an LED substrate 12. In this embodiment, a transparent sapphire substrate is used as the LED substrate. The LED chip 10 is connected and fixed to the mounting board 20 via the conductive pad 70. 1 to 3, for the sake of simplicity, the fixing portion between the sealed container 30 and the mounting substrate 20, the electrode wiring and the power supply circuit for lighting the LED chip 10, and the liquid 90 inside the sealed container 30. A sealing port for sealing the inside is not shown.
[0022]
The material used for the sealed container 30 is selected from metal, glass, plastic, and the like. It is desired that the material be chemically stable at least for the liquid 90 to be enclosed. When glass or transparent plastic (for example, acrylic resin or polycarbonate) is used, the transparent window 40 can be omitted depending on the application.
[0023]
The transparent window 40 is a transparent material and is a chemically stable material with respect to the liquid 90, and has an optical function that allows the light emitted from the LED chip 10 to be taken out of the sealed container 30 without waste. . For example, using glass or a transparent plastic (for example, acrylic resin or polycarbonate), it is formed into a shape that does not block the light emitted from the LED chip 10. Further, the transparent window 40 is fixed to the sealed container 30 by using an appropriate means such as ordinary adhesive fixing or screwing so as not to cause liquid leakage.
[0024]
The cooling fins 50 are made of, for example, a metal such as Fe, Cu, Al, or Mg, or a material containing them and having excellent thermal conductivity. As shown in FIG. 1, a large number of fins (fins) are attached to the cooling fins 50 to increase the surface area, thereby enhancing the heat radiation capability to the outside. In the present embodiment, the cooling fins 50 are fixed to one surface of the outer surface of the sealed container 30 using appropriate means so as not to impair the heat conduction from the sealed container 30. It may be provided on the surface. Further, a part of the sealed container 30 may be formed integrally with the sealed container. If the natural convection of the air flowing between the fins alone does not sufficiently release the heat, an external air-cooling fan may be provided forcibly to cause the air to convection, thereby further improving the heat radiation capability.
[0025]
The liquid 90 is a translucent liquid. Preferably, the liquid is selected from liquids that are electrically insulating and non-corrosive to members provided in the light source device 110. More preferably, a liquid having a low vapor pressure, a low freezing point, excellent thermal stability, and a high thermal conductivity is desired. Examples of liquids applicable to the present invention include those commonly used as organic heat media such as biphenyl diphenyl ethers, alkylbenzenes, alkylbiphenyls, triaryldimethanes, alkylnaphthalenes, hydrogenated terphenyls, and diarylalkanes. Can be used. Further, silicone-based and fluorine-based liquids are also applicable. Among them, the light source device is selected in consideration of the application, required performance, environmental preservation, and the like.
[0026]
In the configuration of the present embodiment described above, the heat generated by turning on the LED chip 10 is extremely efficiently cooled by bringing the liquid 90 into direct contact with the surface of the LED chip 10 that is the heat source. You. The heated liquid 90 naturally convects above the sealed container 30. The heat of the liquid 90 that has moved upward is transmitted to the cooling fins 50 through the container wall of the sealed container 30. The heat transmitted to the cooling fins 50 is exchanged with external air, for example, air. The liquid 90 is efficiently cooled by these heat transfer paths. The cooled liquid 90 descends and is used repeatedly for cooling the LED chip 10. In the present embodiment, the cooling fins 50 are provided to promote cooling. However, the cooling fins 50 may be eliminated depending on the use of the light source device 110, the use environment, and the like.
[0027]
As described above, according to the present embodiment, since the LED chip 10 is directly cooled by the liquid 90, the temperature rise of the LED chip 10 can be suppressed. As a result, the power input to the LED chip 10 can be greatly increased, and the amount of emitted light can be dramatically increased.
[0028]
[Second embodiment]
The second embodiment of the present invention relates to a modification of the light source device 110 described in the first embodiment, and will be described with reference to FIG. FIG. 4 is a cross-sectional view of the light source device 110 according to the present embodiment. The difference from the first embodiment is that in the first embodiment, the LED chip 10 is entirely immersed in the liquid 90 and directly cooled, but in the second embodiment, the LED chip 10 is It is arranged such that the light exit side of the light from is not immersed in the liquid 90. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description of the configuration will be omitted.
[0029]
In FIG. 4, the LED chip 10 connected and fixed to the mounting substrate 20 is arranged so that the emission light surface side faces the transparent window 40, and is fixed to the inner surface side of the sealed container 30 via the elastic member 80. ing. The elastic member 80 is selected from materials that function so as not to allow the liquid 90 to enter the emission light surface side of the LED chip 10, such as an elastic seal material or a rubber packing.
[0030]
In the configuration of the present embodiment described above, the heat generated when the LED chip 10 is turned on is efficiently generated by bringing the liquid 90 into direct contact with the non-emission light surface side of the LED chip 10 that is the heat source. Is cooled. Although the cooling efficiency is lower than that of the first embodiment, it is the same as the first embodiment in that the cooling means is overwhelmingly different from the forced air cooling system of the related art. The heated liquid 90 naturally convects above the sealed container 30. The heat of the liquid 90 that has moved upward is transmitted to the cooling fins 50 through the container wall of the sealed container 30. The heat transmitted to the cooling fins 50 is exchanged with external air, for example, air. The liquid 90 is efficiently cooled by these heat transfer paths. The cooled liquid 90 descends and is used repeatedly for cooling the LED chip 10. In the present embodiment, the cooling fins 50 are provided to promote cooling. However, the cooling fins 50 may be eliminated depending on the use of the light source device 110, the use environment, and the like.
[0031]
Further, an effect of the present embodiment different from that of the first embodiment is that since the emission light surface of the LED chip 10 is not immersed in the liquid 90, the fluctuation phenomenon due to the liquid 90 can be eliminated. In the case where the fluctuation phenomenon due to the liquid 90 occurs depending on the use environment when the first embodiment is carried out and a problem occurs in the light source quality, this embodiment can completely solve the problem.
[0032]
[Third embodiment]
The third embodiment of the present invention relates to the light source device 120 and will be described with reference to FIGS. The difference from the first and second embodiments is that the third embodiment differs from the first embodiment in that the liquid 90 is forcibly circulated. FIG. 5 is a schematic plan view of the light source device 120 of the present embodiment. FIG. 6 is a sectional view of FIG. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description of the configuration is omitted.
[0033]
As shown in FIG. 5, in the light source device 120 of the present embodiment, the LED chip 10, the mounting substrate 20, the transparent window 40, the cooling fins 51, and the circulation pump 60 are arranged at predetermined positions in the annular sealed container 31. . The liquid 90 is filled in the sealed container 31. The liquid 90 is forcibly circulated in the container via the liquid circulation path 31a and the liquid circulation path 31b by the circulation pump 60 provided in the sealed container 31. The cooling fins 51 are arranged between the liquid circulation path 31a and the liquid circulation path 31b of the annular sealed container 31. The basic configuration and functions are the same as those of the cooling fin 50 of the first embodiment. As shown in FIG. 6, the LED chip 10 and the mounting substrate 20 arranged in the sealed container 31 are entirely immersed in a liquid 90. The other configuration is the same as that of the first embodiment, and the description is omitted. 5 and 6, for simplicity of description, a fixing portion between the sealed container 31 and the mounting substrate 20, an electrode wiring and a power supply circuit for lighting the LED chip 10, a power supply for the circulation pump 60, a liquid 90 Is not shown in the drawing.
[0034]
In the configuration of the present embodiment described above, the heat generated by turning on the LED chip 10 is extremely efficiently cooled by bringing the liquid 90 into direct contact with the surface of the LED chip 10 that is the heat source. You. The heated liquid 90 is sent by the circulation pump 60 to the cooling fin section 52 via the liquid circulation path 31a. In the cooling fin unit 52, heat from the liquid 90 is transmitted to the cooling fin 51 through the container wall of the sealed container 31. The heat transmitted to the cooling fins 51 is exchanged with, for example, air outside. The liquid 90 is efficiently cooled by these heat transfer paths. The cooled liquid 90 is repeatedly used for cooling the LED chip 10 via the liquid circulation path 31b. In the present embodiment, the cooling fins 51 are provided to promote cooling, but the cooling fins 51 may be eliminated depending on the use of the light source device 120, the use environment, and the like.
[0035]
As described above, according to the present embodiment, since the LED chip 10 is continuously and directly cooled by the liquid 90 circulated by the circulation pump 60 and cooled by the cooling fins 51, the temperature rise of the LED chip 10 is further reduced. It can be suppressed effectively. As a result, the power input to the LED chip 10 can be greatly increased, and the amount of emitted light can be further increased.
[0036]
[Fourth embodiment]
The fourth embodiment of the present invention relates to a modification of the light source device 120 described in the third embodiment, and will be described with reference to FIG.
FIG. 7 is a sectional view of FIG. 5 in the present embodiment. The difference from the third embodiment is that in the third embodiment, the LED chip 10 is entirely immersed in the liquid 90 and directly cooled, but in the fourth embodiment, the LED chip 10 is It is arranged such that the light exit side of the light from is not immersed in the liquid 90. The same parts as those in the third embodiment are denoted by the same reference numerals, and the description of the configuration is omitted.
[0037]
In the present embodiment of FIG. 7, the LED chip 10 connected and fixed to the mounting substrate 20 is disposed so that the emission light surface side faces the transparent window 40, and the inner surface of the sealed container 31 via the elastic member 80. Is fixed to the side. The elastic member 80 is selected from materials that function so as not to allow the liquid 90 to enter the emission light surface side of the LED chip 10, such as an elastic seal material or a rubber packing.
[0038]
In the configuration of the present embodiment described above, the heat generated when the LED chip 10 is turned on is efficiently generated by bringing the liquid 90 into direct contact with the non-emission light surface side of the LED chip 10 that is the heat source. Is cooled. Although the cooling efficiency is lower than that of the third embodiment, it is the same as the third embodiment in that the cooling means is overwhelmingly different from the forced air cooling system of the related art. The heated liquid 90 is sent by the circulation pump 60 to the cooling fin section 52 via the liquid circulation path 31a. In the cooling fin unit 52, heat from the liquid 90 is transmitted to the cooling fin 51 through the container wall of the sealed container 31. The heat transmitted to the cooling fins 51 is exchanged with, for example, air outside. The liquid 90 is efficiently cooled by these heat transfer paths. The cooled liquid 90 is repeatedly used for cooling the LED chip 10 via the liquid circulation path 31b. In the present embodiment, the cooling fins 51 are provided to promote cooling, but the cooling fins 51 may be eliminated depending on the use of the light source device 120, the use environment, and the like.
[0039]
As described above, according to the present embodiment, since the LED chip 10 is continuously and directly cooled by the liquid 90 circulated by the circulation pump 60 and cooled by the cooling fins 51, the temperature rise of the LED chip 10 is further reduced. It can be suppressed effectively. As a result, the power input to the LED chip 10 can be greatly increased, and the amount of emitted light can be further increased.
[0040]
Furthermore, an effect of the present embodiment different from that of the third embodiment is that the light emitting surface of the LED chip 10 is not immersed in the liquid 90, so that the fluctuation phenomenon due to the liquid 90 can be completely eliminated. In the case where the fluctuation phenomenon due to the liquid 90 occurs depending on the use environment when the third embodiment is carried out and the light source quality is problematic, the present embodiment can completely solve the problem.
[0041]
[Fifth Embodiment]
The fifth embodiment of the present invention relates to a light source device, which will be described with reference to FIGS. The difference from the first to fourth embodiments is that the fifth embodiment is different from the first to fourth embodiments in that a plurality of LED chips are stacked. FIG. 8 is a schematic plan view of the light source device 120 of the present embodiment. 9A and 9B are a plan view (a) and a cross-sectional view (b) of a plurality of stacked LED chips 15 and a mounting board 20, which constitute the light source device 120 of FIG. FIG. 10 is a sectional view of FIG. The same parts as those in the first to fourth embodiments are denoted by the same reference numerals, and the description of the configuration will be omitted.
[0042]
As shown in FIG. 8, the light source device 120 of the present embodiment includes a plurality of stacked LED chips 15. The other configuration is the same as that of the third embodiment, and the description is omitted.
[0043]
As shown in FIG. 9, the LED chip 15 includes an LED light emitting area 11 and an LED substrate 12. In this embodiment, a transparent sapphire substrate is used as the LED substrate. The LED chips 15 are connected and fixed to both surfaces of the mounting board 20 via the conductive pads 70. In FIG. 9B, as an example, four LED chips 15 are stacked so as to face each other. The four stacked LED chips 15 are arranged such that the liquid 90 is in direct contact with the surface of each LED chip, and the liquid 90 is separated from each other at an interval capable of moving between the LED chips. I have. The light emitted from the LED light emitting region 11 is mainly emitted in the plane direction. In this embodiment, since the LED substrate 12 is a transparent sapphire substrate, light is emitted from both sides of the LED light emitting region 11. Therefore, when it is desired to emit light only in one direction (in the embodiment, the transparent window 40 side), it is desirable to form a reflection film on the surface of the LED chip 15 farthest from the emission light surface (shown in FIG. 9). Zu). By doing so, the light emitted from each of the stacked LED chips is emitted to the outside from a predetermined emission surface as light having an emitted light quantity corresponding to the number of stacked layers.
[0044]
As shown in FIG. 10, the LED chips 15 and the mounting substrate 20 in which a plurality are stacked are entirely immersed in a liquid 90. 8 to 10, for the sake of simplicity, the fixing portion between the sealed container 31 and the mounting substrate 20, the connecting portion where each of the stacked mounting substrates 20 is connected, and the LED chip 15 are turned on. An electrode wiring and a power supply circuit, a power supply for the circulating pump 60, and a sealing port for sealing the liquid 90 in the sealed container 30 are not shown.
[0045]
In the above-described configuration of the present embodiment, by stacking four LED chips 15 having the same area, it is possible to increase the amount of emitted light almost four times while the area of the emitted light is almost the same as that of one LED chip. It becomes. Further, the heat generated when the stacked LED chips 15 are turned on is cooled very efficiently by bringing the liquid 90 into direct contact with the surface of each LED chip 15 which is a heat generation source. . Since the stacked LED chips 15 are stacked at an appropriate distance from each other, the liquid 90 is always in direct contact with the surface of the LED chip 15, and a reliable cooling means and Become. The heated liquid 90 is sent by the circulation pump 60 to the cooling fin section 52 via the liquid circulation path 31a. In the cooling fin unit 52, heat from the liquid 90 is transmitted to the cooling fin 51 through the container wall of the sealed container 31. The heat transmitted to the cooling fins 51 is exchanged with, for example, air outside. The liquid 90 is efficiently cooled by these heat transfer paths. The cooled liquid 90 is repeatedly used for cooling the LED chip 15 via the liquid circulation path 31b. In the present embodiment, the cooling fins 51 are provided to promote cooling, but the cooling fins 51 may be eliminated depending on the use of the light source device 120, the use environment, and the like.
[0046]
As described above, according to the present embodiment, by stacking a plurality of LED chips 15, it is possible to increase the emission light amount by a plurality of times while the emission light area is almost the same as in the case of one. It becomes possible. In addition, since the stacked LED chips 15 are continuously and directly cooled by the liquid 90 circulated by the circulation pump 60 and cooled by the cooling fins 51, the temperature of the stacked LED chips 15 is reduced. The rise can be suppressed efficiently. Further, in the present embodiment, since the respective LED chips 15 are stacked and arranged at an appropriate distance from each other, the liquid 90 always comes into direct contact with the surface of the LED chips 15. Therefore, the LED chip 15 is reliably and efficiently cooled. As a result, the power applied to each LED chip 15 can be greatly increased, and the amount of emitted light can be further increased. In the present embodiment, the light source device 120 has been described. However, the same effect can be obtained in the light source device 110.
[0047]
[Sixth embodiment]
The sixth embodiment of the present invention relates to a projection display device, and relates to a small projection display device suitable for using the light source device described in the first to fifth embodiments. FIG. 11 shows a schematic configuration diagram of an optical system of the projection display 1 according to the present embodiment.
[0048]
As shown in FIG. 11, the projection display device 1 of the present embodiment includes a light source device 100, a liquid crystal panel (light modulation element) 200, a projection lens 300, and a housing 500. This is a so-called single-panel projection display device having one liquid crystal panel. The light source device 100 uses the same light source device as in the first embodiment. The light emission color of the light source device 100 is white. The liquid crystal panel 200 is configured to be capable of performing light modulation such that light is transmitted or not transmitted in pixel units according to a change in voltage of a control signal supplied to a drive circuit (not shown). The liquid crystal panel 200 includes a color filter, and a plurality of pixels corresponding to RGB constitute a color pixel. By controlling whether or not each color light of RGB is transmitted, color display is possible. These configurations are the same as those of a liquid crystal panel having a known color filter. The projection lens 300 is configured to form an image emitted from the liquid crystal panel 200 on the screen 600. Although only one projection lens is shown in FIG. 1, it goes without saying that a plurality of lenses may be used. The housing 500 is configured as a storage container for the entire projection display device, and is configured so that each optical element can be appropriately arranged.
[0049]
In the configuration of the present embodiment described above, high-luminance white light is emitted from the light source device 100, and is light-modulated by the liquid crystal panel 200 for each of RGB. The light modulated color lights are combined as a bright color image on the screen 600 by the projection lens 300.
[0050]
[Seventh embodiment]
The seventh embodiment of the present invention relates to a projection display device, and relates to a small projection display device suitable for using the light source device described in the first to fifth embodiments. The difference from the sixth embodiment is that the seventh embodiment includes three light source devices and three liquid crystal panels. FIG. 12 is a schematic configuration diagram of an optical system of the projection display device 2 according to the present embodiment. The same components as those in the sixth embodiment are denoted by the same reference numerals, and the description of the configuration is omitted.
[0051]
As shown in FIG. 12, the projection display device 2 of the present embodiment includes light source devices 100R, 100G, and 100B, three liquid crystal panels (light modulation elements) 200, a dichroic prism 400, a projection lens 300, and a housing 500. It is comprised including. This is a so-called three-panel type projection display device having three liquid crystal panels. The structures of the light source devices 100R, 100G, and 100B are the same as those of the light source devices 100R, 100G, and 100B except that the LED chips of the light source devices 100R, 100G, and 100B respectively emit red, green, and blue light. 5 is basically the same as the light source device of FIG. Red (R) light is emitted from the light source device 100R, green (G) light is emitted from the light source device 100G, and blue (B) light is emitted from the light source device 100B. If the light source device is configured by an LED that emits the same white light as that of the sixth embodiment, a color filter for converting the white light into each color light of RGB is provided between the light source device 100 and the liquid crystal panel 200. The liquid crystal panel 200 and the dichroic prism 400 may be arranged between them. The dichroic prism 400 includes a multilayer film 400R capable of reflecting only R and a multilayer film 400B capable of reflecting only B. The dichroic prism 400 can synthesize an image light-modulated for each of RGB and emit the light toward the projection lens 300. Is configured.
[0052]
In the above-described configuration of the present embodiment, each of the light source devices 100R, 100G, and 100B emits a high-luminance color light, and the light is modulated by the liquid crystal panel 200 corresponding to each light source device. The light modulated color lights are combined as a bright color image on the screen 600 by the projection lens 300. According to this configuration, a brighter color image can be obtained than in the single-panel projection display of the sixth embodiment.
[0053]
As described above, the light source device according to the embodiment of the present invention and the projection display device using the same have been described. However, the embodiment can be freely modified within the scope of the present invention. For example, in the third to fifth embodiments, the description has been made using the annular container as the sealed container. However, the effects of the present invention can be obtained by using the same box-shaped container as in the first and second embodiments. Further, in the embodiment, the description has been made using the LED chip as the light source device. However, the present invention is also applicable to a solid-state light emitting element such as a semiconductor laser. Further, for example, in the embodiments, the description has been made using the transmission type liquid crystal panel as the light modulation element. However, the reflection type liquid crystal panel (LCOS), the digital micromirror device (DMD), and the like can be used by using the light source device of the present invention. A similar effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a light source device 110 according to a first embodiment.
FIG. 2 is a cross-sectional view of the light source device 110 of FIG.
FIG. 3 is a plan view (a) and a cross-sectional view (b) of the LED chip 10 and the mounting board 20 of FIG.
FIG. 4 is a cross-sectional view of the light source device 110 of FIG. 1 in a second embodiment.
FIG. 5 is a schematic plan view of a light source device 120 according to a third embodiment.
FIG. 6 is a sectional view of FIG. 5;
FIG. 7 is a sectional view of FIG. 5 in a fourth embodiment.
FIG. 8 is a schematic plan view of a light source device 120 according to a fifth embodiment.
9 is a plan view (a) and a cross-sectional view (b) of the LED chip 15 and the mounting board 20 of FIG.
FIG. 10 is a sectional view of FIG. 8;
FIG. 11 is a schematic configuration diagram of an optical system of a projection display device 1 according to a sixth embodiment.
FIG. 12 is a schematic configuration diagram of an optical system of a projection display device 2 according to a seventh embodiment.
[Explanation of symbols]
1, 2, projection type display device, 10, 15, LED chip, 20: mounting substrate, 30: sealed container, 40: transparent window, 50, 51: cooling fin, 60: circulation pump, 90: liquid, 100, 110 , 120: Light source device, 200: Liquid crystal panel, 300: Projection lens, 400: Dichroic prism

Claims (7)

A mounting substrate, including an LED chip disposed on the mounting substrate, and a sealed container filled with liquid, wherein the LED chip is directly cooled by the liquid, and at least a part of the sealed container is separated from the LED chip. A light source device having a configuration to transmit light. The light source device according to claim 1, wherein the non-emission light surface side of the light from the LED chip is directly cooled. The light source device according to claim 1, wherein a cooling unit for cooling the filled liquid is provided in the sealed container. The light source device according to any one of claims 1 to 3, wherein the sealed container is provided with a circulating unit for circulating the filled liquid. The light source device according to claim 1, wherein a plurality of the LED chips are stacked. A plurality of the stacked LED chips are spaced apart from each other and are arranged in a stacked manner, and the separated portion is filled with the liquid and each of the LED chips is directly cooled. Item 6. The light source device according to item 5. A light source device according to any one of claims 1 to 6, a light modulator for modulating light from the light source device, and a projection lens for projecting modulated light from the light modulator. Projection type display device.

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