JP2005079066A - Light source device and projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized light source device with high brightness suitable for a small-sized projection type display device, and the projection type display device using the light source device. <P>SOLUTION: The light source device has a solid light source 21 irradiating light, a liquid medium removing heat generated at the solid light source 21, flow passages 31, 36 through which the liquid medium flows. The flow passages 31, 36 are arranged so as to exchnage heat of one surface with the other surface of the solid light source. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light source device and a projection display device.

  In recent years, projection display devices have been reduced in size, increased in brightness, extended in life, reduced in price, and the like. For example, with respect to miniaturization, the size of the liquid crystal panel (light modulation element) has been reduced from a diagonal of 1.3 in to 0.5 in and an area ratio of slightly over 1/6.

  On the other hand, miniaturization by using a light emitting diode (LED) light source, which is a solid state light source, is proposed as a light source of a projection display device. The LED light source has a merit as a light source for a projection display device, such as being small in size including a power source, capable of instantaneous lighting / extinguishing, and wide color reproducibility and long life. Further, since it does not contain harmful substances such as mercury, it is preferable from the viewpoint of environmental protection.

  However, in order to use the LED light source as the light source for the projection display device, the brightness as the light source is insufficient, and at least the brightness of the discharge type light source lamp level needs to be secured (high brightness, low etendue). was there. Here, etendue is a numerical value represented by the product of the area and the solid angle, which is the spatial extent in which a luminous flux that can be effectively utilized exists, and is optically stored. As described above, since the liquid crystal panel is downsized and the etendue of the liquid crystal panel is becoming smaller, the etendue of the light source needs to be equal or less.

However, as the brightness of the LED light source is increased, heat generation from the LED light source increases more and the luminous efficiency decreases as the temperature of the LED light source rises. Therefore, it is necessary to take some heat generation measures. In general, the forced air cooling method using a fan has insufficient cooling efficiency, and fan noise is a problem. Therefore, a method for forcibly cooling the LED light source using a liquid has been proposed. According to the liquid cooling method, an effect is also expected to eliminate the noise of the forced air cooling method (see, for example, Patent Documents 1 and 2).
JP-A-6-5923 JP-A-7-99372

  As described above, in the LED light source in Patent Document 1, a cooling material such as liquid nitrogen is allowed to flow around the LED, thereby forcibly cooling the LED and the cooling material in direct contact with each other. However, the configuration of the LED light source is complicated, such as the need for a heat insulating case, and the manufacture thereof is not practical. Therefore, there is a problem that it is difficult to ensure at least the brightness of the discharge type light source lamp.

  In the LED light source in Patent Document 2, an insulating inert liquid is sealed around the LED chip to cool the LED chip. However, there is no means for actively cooling the insulating inert liquid, the cooling effect is low, and it is difficult to cool the LED chip for a long time, and at least the brightness of the discharge type light source lamp level is ensured. There was a problem of difficulty.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a small, high-intensity light source device suitable for a small projection display device and a projection display device using the same. And

  In order to achieve the above object, a light source device of the present invention includes a solid light source that emits light, a liquid medium that takes away heat generated by the solid light source, and a flow path through which the liquid medium flows. The path is arranged to exchange heat with one surface and the other surface of the solid-state light source.

In other words, the light source device of the present invention is arranged such that the flow path through which the liquid medium flows exchanges heat with one surface and the other surface of the solid light source, so that the heat generated by the solid light source is on one surface and the other surface. It can be taken away from the surface and cooled. As a result, the input power to the solid light source can be increased, the amount of light that can be emitted from the solid light source can be increased, and high luminance can be achieved.
Further, even if the area of the solid light source is reduced to reduce the etendue, the input power can be increased, so that high luminance can be maintained.

In order to realize the above-described configuration, it is desirable that the flow path is provided with a heat radiating means for performing heat exchange between the liquid medium and the medium outside the flow path.
According to this configuration, since the heat of the liquid medium can be released to the medium outside the flow path by the heat radiating means, the temperature of the liquid medium can be lowered. As the temperature of the liquid medium decreases, the temperature difference from the solid light source increases, and more heat can be taken from the solid light source. As a result, the input power to the solid light source can be further increased, the amount of light that can be emitted from the solid light source can be further increased, and higher luminance can be achieved. In addition, since the cooling capacity of the liquid medium can be maintained for a long time, the brightness of the solid light source can be maintained for a long time.

More specifically, in order to realize the above configuration, the heat exchange surface of the flow channel is wider than one surface or the other surface of the solid light source in the region where the flow channel exchanges heat with the solid light source. Is desirable.
According to this configuration, since the heat exchange surface is wider than the one surface or the other surface, the heat exchange surface projects laterally from the solid light source. The liquid refrigerant takes away the heat of the medium (for example, air) that comes into contact with the end surface of the solid light source (the surface between the one surface and the other surface) from the projecting portion. It can take heat away and cool the solid light source.

More specifically, in order to realize the above-described configuration, it is desirable that the refractive indexes of the flow channel and the liquid medium are substantially the same as the refractive index of the medium existing around the flow channel.
According to this configuration, when the light emitted from the solid light source passes through the flow path and the liquid medium, the light can be transmitted without being refracted at each interface.

More specifically, in order to realize the above-described configuration, the flow rate of the liquid medium flowing in the flow path that exchanges heat with one surface, and the flow rate of the liquid medium that flows in the flow path that exchanges heat with the other surface, , May be different.
According to this configuration, the amount of heat that the liquid medium can exchange with one surface of the solid light source and the amount of heat that can be exchanged with the other surface can be changed.
For example, when the heat generating part of the solid light source is close to one surface, the temperature of one surface becomes higher than that of the other surface. Therefore, the solid medium light source can be efficiently deprived of heat by increasing the flow rate per unit time of the liquid medium in the flow path for heat exchange with the one surface and depriving one of the surfaces of more heat.

In order to realize the above configuration, more specifically, the liquid medium flowing in the flow path exchanging heat with one surface is different from the liquid medium flowing in the flow path exchanging heat with the other surface. Also good.
According to this configuration, by changing the liquid medium, the amount of heat that the liquid medium can exchange with one surface of the solid light source and the amount of heat that can be exchanged with the other surface can be changed.
For example, when the heat generating part of the solid light source is close to one surface, the temperature of one surface becomes higher than that of the other surface. Therefore, by making the liquid medium in the flow path that exchanges heat with one surface a liquid medium with higher specific heat and / or higher thermal conductivity, more heat can be taken from one surface, and the solid-state light source can be efficiently removed. Can take away the heat.

In order to realize the above configuration, more specifically, it is desirable that the flow path is a circulation flow path, and the circulation flow path is provided with a circulation means for circulating the liquid medium.
According to this configuration, since the liquid medium always flows in the circulation flow path by the circulation means, the liquid medium always flows in the flow path that exchanges heat with one surface and the other surface of the solid light source. Therefore, the temperature difference between the one surface and the other surface and the liquid medium flowing in the flow path can be maintained constant, and the cooling capacity of the liquid medium with respect to the solid light source can be maintained more stably.

More specifically, in order to realize the above configuration, the circulation channel is formed with a first channel that exchanges heat with one surface and a second channel that exchanges heat with the other surface. The first flow path and the second flow path may be connected in parallel.
According to this configuration, for example, the flow rate per unit time of the liquid medium flowing in the first flow path and the second flow path is made different by changing the flow path resistances of the first flow path and the second flow path. Can be made. Therefore, when the temperature of the one surface is higher than that of the other surface, the flow rate of the liquid medium flowing through the first channel is increased more than the flow rate of the second channel, and more heat is taken from the one surface. The solid light source can be efficiently cooled.

More specifically, in order to realize the above configuration, the circulation channel is formed with a first channel that exchanges heat with one surface and a second channel that exchanges heat with the other surface. The first flow path and the second flow path may be connected in series.
According to this configuration, for example, when the temperature of the one surface is higher than that of the other surface, the liquid medium is first flowed through the second flow path, and then the liquid medium is flowed through the first flow path. Heat can be effectively removed not only from the one surface having the high temperature but also from the other surface having the low temperature, and the solid light source can be effectively cooled.

In order to realize the above-described configuration, more specifically, a first circulation channel that exchanges heat with one surface, and a second circulation channel that exchanges heat with the other surface, The first circulation flow path and the second circulation flow path may be provided with a circulation means for circulating the liquid medium.
According to this configuration, since the first circulation channel and the second circulation channel form independent circulation channels, the type of liquid medium flowing in each circulation channel can be changed, or the liquid medium The flow rate per unit time can be changed. Therefore, an appropriate liquid medium and flow rate can be selected to cool the one surface and the other surface, respectively, and the solid light source can be effectively cooled.

  A projection display device according to the present invention includes a light source device that emits light, a light modulation unit that modulates light from the light source device, and a projection unit that projects light modulated by the light modulation unit. A light source device is the light source device of the present invention.

That is, the projection display device of the present invention includes the light source device of the present invention,
The size of the projection display device can be reduced, and the brightness of the displayed image can be improved.

[Light source device]
Hereinafter, a light source device according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic view of a light source device according to the present invention.
As shown in FIG. 1, the light source device 10 includes a light source unit 20 that emits light, a circulation channel 55 through which a liquid 50 that cools the light source unit 20 flows, and a circulation pump (circulation) that circulates the liquid (liquid medium) 50. Means) 56 and cooling fins (heat dissipating means) 57 for cooling the liquid 50 whose temperature has been increased by removing heat from the light source unit 20.

FIG. 2 is a plan view of a light source unit of the light source device. 3 is a cross-sectional view taken along line AA in FIG.
2 and 3, the light source unit 20 cools the LED chip (solid light source) 21 that emits light, the optical system 25 that guides the emitted light to the illuminated area, and the LED chip 21. The first flow path (flow path) 31 and the second flow path (flow path) 36 and a conductive system 40 that supplies electricity to the LED chip 21 are schematically configured.
The LED chip 21 is flip-chip mounted on the substrate 45. On the substrate 45, substrate terminals 41 and mounting terminals 42, which are conductive systems 40, are disposed, and an insulating resin 43 with good thermal conductivity is disposed so as to fill the gap between the substrate 45 and the LED chip 21.

4A is a schematic plan view of the lower surface cooling unit of the light source unit, and FIG. 4B is a cross-sectional view taken along line BB in FIG.
As shown in FIG. 3, a lower surface cooling unit 46 is disposed on the lower surface of the substrate 45. The lower surface cooling unit 46 includes a cooling unit main body 46a and a lid body 46b. A groove is formed in the cooling unit main body 46a, and the cooling unit main body 46a and the lid body 46b are bonded to each other. 4 (a), the 1st flow path 31 as shown to (b) is formed. The first flow path 31 is formed with a heat exchange surface 31a whose flow path width extends to W in the region where the LED chip 21 is mounted.

Fig.5 (a) is a plane schematic diagram of the upper surface cooling part of a light source part, FIG.5 (b) is CC sectional view taken on the line of CC of (a).
As shown in FIG. 3, an upper surface cooling unit 47 is disposed on the upper surface of the LED chip 21. The upper surface cooling unit 47 includes a cooling unit main body 47a and a lid body 47b. A groove is formed in the cooling unit main body 47a, and the cooling unit main body 47a and the lid body 47b are bonded to each other. A second flow path 36 is formed as shown in 5 (a) and 5 (b). In the second flow path 36, a heat exchange surface 36a is formed in which the width of the flow path extends to W in the region where the LED chip 21 is mounted.
Further, the upper surface cooling unit 47 is transparent as a material and chemically stable with respect to the liquid 50, and has an optical function of transmitting the emitted light from the LED chip 21 without being damaged (for example, glass , Acrylic resin, polycarbonate, etc.).

FIG. 6 is an enlarged cross-sectional view of the LED chip mounting portion.
As shown in FIG. 6, the upper surface cooling unit 47 and the lower surface cooling unit 46 are arranged so that heat can be exchanged from the upper surface or the lower surface of the LED chip 21, and the LED chip 21 is substantially at the center of the heat exchange surfaces 31 a and 36 a. It is arranged in the part.
The length of the heat exchange surfaces 31a and 36a that protrudes outward from the LED chip 21 is L, and the distance between the first flow path 31 and the second flow path 36 is T. At that time, there arises a problem of how to set the value of L. This problem varies depending not only on the value of T, but also on the physical properties such as the thermal conductivity of the substance between the first flow path 31 and the second flow path 36, and also on the cooling target value. Can not. Qualitatively, as the heating value increases with respect to the cooling capacity, the cooling efficiency increases as the value of L is increased to some extent. However, increasing L unnecessarily will worsen the cooling efficiency. In any case, the optimum L value for efficient cooling is not zero or negative, but is positive. Based on the above basic recognition, as an approximate guide, it is desirable to set the following relationship between the overhang length L and the interval T.
(1) When the ratio of (heat generation from LED chip 21) / (cooling capacity) is not so large L ≧ T
(2) When the ratio of (heat generation from the LED chip 21) / (cooling capacity) is large L> 2T to 3T
However, L = (W−Wt) / 2 (Wt is the vertical or horizontal length of the LED chip 21)
Here, the cooling capacity is the ability of the light source device 10 to release the heat generated from the LEDs 21 to the outside from the cooling fins 57.

  As shown in FIG. 3, a transparent heat conductor 49 is disposed between the upper surface cooling unit 47 and the substrate 45 so as to cover the periphery of the LED chip 21. The transparent heat conductor 49 has a good thermal conductivity as a material and is chemically stable with respect to the liquid 50, and has an optical function of transmitting light emitted from the LED chip 21 without being damaged (for example, , Silicone gel, etc.).

As shown in FIG. 3, the optical system 25 includes a reflecting portion 26 that reflects light emitted substantially laterally from the LED chip 21 toward the illuminated area, and condenses or collimates the light in the illuminated area. And a lens 27 is provided.
The reflector 26 is disposed on the substrate 45. Moreover, the reflection part 26 is formed in the annular | circular shape, and the reflective surface 26a which inclines to the to-be-illuminated area | region side is formed in the surface which opposes the LED chip 21 outward. The lens 27 is disposed on the reflection unit 26. The lens 27 is formed with a convex portion 27a that condenses or balances the light emitted from the LED chip 21 in the illuminated area. The lens 27 is transparent as a material and chemically stable with respect to the liquid 50, and has an optical function of transmitting light emitted from the LED chip 21 without being damaged (for example, glass or acrylic). Resin, polycarbonate, etc.).
A transparent resin 48 is disposed between the upper surface cooling unit 47 and the reflection unit 26 and the lens 27 so as to fill the space. The transparent resin 48 is transparent as a material, and has an optical function of transmitting light emitted from the LED chip 21 without being damaged (for example, silicon gel).

  The liquid 50 is a translucent liquid. The liquid is preferably selected from liquids that are electrically insulating and are non-corrosive to the 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 high thermal conductivity is desired. Examples of liquids that can be applied to the present invention are general organic heat transfer media such as biphenyl diphenyl ether, alkyl benzene, alkyl biphenyl, triaryl dimethane, alkyl naphthalene, hydrogenated terphenyl, and diaryl alkane. Can be mentioned. Silicone and fluorine liquids are also applicable. Among these, the light source device is selected in consideration of the application, required performance, environmental conservation and the like.

The cooling fin 57 is made of, for example, a metal such as Fe, Cu, Al, or Mg, or a material that includes them and has excellent thermal conductivity. As shown in FIG. 1, the cooling fins 57 are provided with a large number of fins (fins) to increase the surface area, thereby increasing the heat dissipation capability to the outside. In the present embodiment, the cooling fin 57 is fixed to one surface of the outer surface of the circulation channel 55 by using an appropriate means so as not to impair the heat conduction from the circulation channel 55. It may be provided on the outer surface. Further, a part of the circulation channel 55 may be formed integrally with the sealed container. In addition, if the natural convection of the air flowing between the fins is not enough to radiate heat, the air convection can be forcibly provided by providing an external air-cooling fan to enhance the heat radiation capability.
In the present embodiment, the cooling fins 57 for promoting the cooling are described. However, depending on the use and usage environment of the light source device 10, the cooling fins 57 may be applied. You can also.
Further, the material used for the upper surface cooling unit 47, the liquid 50, and the transparent resin 48 may be a material having a refractive index substantially the same as the refractive index of the lens 27. According to this configuration, when the light emitted from the LED chip 21 passes through the upper surface cooling unit 47, the liquid 50, and the transparent resin 48, the light can be transmitted without being reflected at each interface.

Next, the operation of the light source device 10 having the above configuration will be described.
When power is supplied to the LED chip 21 from the substrate terminal 41, light is emitted from the LED chip 21 toward the periphery. The light that has entered the upper surface cooling unit 47 passes through the upper surface cooling unit 47 and the liquid 50 and is emitted toward the lens 27, and the light that has entered the reflection unit 26 is reflected toward the lens 27. The light incident on the lens 27 is refracted by the convex portion 27a, and is condensed or collimated toward the illuminated area and emitted.

The liquid 50 is pumped by the circulation pump 56 toward the light source unit 20 in the circulation channel 55. The liquid 50 that has flowed into the light source unit 20 flows into the first flow path 31 and the second flow path 36.
The heat generated in the LED chip 21 is transmitted to the lower surface cooling unit 46 through the upper surface cooling unit 47, the insulating resin 43, and the substrate 45 that are in direct contact. The liquid 50 flowing through the first flow path 31 and the second flow path 36 cools the LED chip 21 by removing the heat transferred to the upper surface cooling unit 47 and the lower surface cooling unit 46. The liquid 50 whose temperature has risen due to heat removal joins the circulation channel 55 and flows into the portion where the cooling fins 57 are arranged. The heat of the liquid 50 is transmitted to the cooling fins 57 through the wall surface of the circulation channel 55. The heat transmitted to the cooling fin 50 is radiated to the outside, for example, air, and the liquid 50 is cooled. The cooled liquid 50 flows again into the circulation pump 56 and is pumped again toward the light source unit 20.
The heat transferred from the LED chip 21 to the transparent heat conductor 49 is transferred to the lower surface cooling unit 46 via the upper surface cooling unit 47 and the substrate 45 that are in direct contact with the transparent heat conductor 49. The heat transferred to the upper surface cooling unit 47 and the lower surface cooling unit 46 is taken away by the liquid 50, and the LED chip 21 is cooled.

According to said structure, since the 1st flow path 31 and the 2nd flow path 36 through which the liquid 50 flows are arrange | positioned so that heat exchange may be carried out with the lower surface and upper surface of LED chip 21, the heat | fever which generate | occur | produces in LED chip 21 is carried out. It can be taken from the upper surface and the lower surface and cooled. As a result, the input power to the LED chip 21 can be increased, the amount of light that can be emitted from the LED chip 21 can be increased, and high luminance can be achieved.
Further, even if the area of the LED chip 21 is reduced and the etendue is lowered, the input power to the LED chip 21 can be increased, so that high luminance can be maintained.

  Since the heat of the liquid 50 can be released to the medium outside the circulation flow path 55 by the radiation fins 57, the temperature of the liquid 50 can be lowered. As the temperature of the liquid 50 decreases, the temperature difference between the liquid 50 and the LED chip 21 increases, and more heat can be taken from the LED chip 21. As a result, the input power to the LED chip 21 can be further increased, the amount of light that can be emitted from the LED chip 21 can be further increased, and higher luminance can be achieved. In addition, since the cooling capacity of the liquid 50 can be maintained for a long time, the high brightness of the LED chip 21 can be maintained for a long time.

  Since the heat exchanging surfaces 31 a and 36 a are wider than the lower surface and the upper surface of the LED chip 21, the heat exchanging surfaces 31 a and 36 a protrude laterally from the LED chip 21. The liquid 50 takes heat of the transparent heat conductor 49 in contact with the end face of the LED chip 21 from the protruding portion, and the transparent heat conductor 49 deprived of heat takes heat from the LED chip 21 and cools the LED chip 21. be able to.

  Since the first flow path 31 and the second flow path 36 are connected in parallel, for example, the first flow path 31 and the second flow path 36 are made different from each other, thereby making the first flow path 31 different. The flow rate per unit time of the liquid 50 flowing through the second flow path 36 can be made different. Therefore, when the temperature of the lower surface of the LED chip 21 is higher than that of the upper surface, the flow rate of the liquid 50 flowing through the first flow channel 31 can be increased more than the flow rate of the second flow channel 36, and more heat is taken from the lower surface. The LED chip 21 can be efficiently cooled.

  Since the liquid 50 always flows in the circulation channel 55 by the circulation pump 56, the liquid 50 always flows in the first channel 31 and the second channel 36 that exchange heat with the upper surface and the lower surface of the LED chip 21. Therefore, the temperature difference with the liquid 50 flowing through the first flow path 31 and the second flow path 36 can be kept constant, and the cooling ability of the liquid 50 with respect to the LED chip 21 can be maintained more stably.

FIG. 7 is a schematic view of a light source device according to another embodiment of the present invention.
The connection between the circulation channel 55 and the first channel 31 and the second channel 36 is not limited to the parallel coupling method as shown in FIG. 1, but as shown in FIG. 55, the first flow path 31 and the second flow path 36 may be arranged and coupled in series.
By adopting such a configuration, the liquid 50 can be caused to flow through the first flow path 31 and the second flow path 36 by the single circulation pump 56, which is suitable for downsizing the light source device 10.

FIG. 8 is a schematic view of a light source device according to still another embodiment of the present invention.
Further, the present invention is not limited to the configuration in which the first flow path 31 and the second flow path 36 are provided in one circulation flow path 55, but the first circulation flow path 55A and the second circulation flow path 55B are provided as shown in FIG. They may be provided so that each plays the role of the first flow path 31 and the second flow path 36.
By adopting such a configuration, the first circulation channel 55A and the second circulation channel 55B form independent circulation channels, so the type of the liquid 50 flowing in each circulation channel is changed. In addition, the flow rate per unit time of the liquid 50 can be changed. Therefore, an appropriate liquid medium and flow rate can be selected for cooling the upper and lower surfaces of the LED chip, respectively, and the LED chip can be effectively cooled.

[Projection type display device]
FIG. 9 is a schematic configuration diagram of a single-plate projection display device using the light source device of the present invention.
The projection display device 1 shown in FIG. 9 is a small single-plate projection display device suitable for using the light source device 10 described above.
As shown in FIG. 9, the projection display device 1 includes a light source device 10 that emits white light, a liquid crystal panel (light modulation means) 200 that modulates white light, and a projection lens (projection) that projects the modulated light. Means) 300 and a casing 500 for storing them. This is a so-called single-plate projection display device having one liquid crystal panel.
The liquid crystal panel 200 is configured to be capable of light modulation in which light is transmitted or not transmitted in units of pixels in accordance with a change in voltage of a control signal supplied to a drive circuit (not shown). In addition, the liquid crystal panel 200 includes a color filter, and a color pixel is composed of a plurality of pixels corresponding to RGB. Color display is possible by controlling the transmission or non-transmission of RGB light. These structures are the same as those of a liquid crystal panel provided with 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 the figure, it is needless to say that it may be composed of a plurality of lenses. 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.

  In the projection display device having such a configuration, high-intensity white light is emitted from the light source device 10 and light-modulated for each RGB by the liquid crystal panel 200. The light-modulated color lights are synthesized as a bright color image on the screen 600 by the projection lens 300.

FIG. 10 is a schematic configuration diagram of a three-plate projection display device using the light source device of the present invention.
The projection display device 2 shown in FIG. 10 is a small three-plate projection display device suitable for using the light source device 10 described above. It differs from the projection display device 1 described above in that it includes three sets of light source devices and liquid crystal panels. Therefore, the same parts as those of the projection display device 1 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 10, the projection display device 2 includes light source devices 10R, 10G, and 10B, three liquid crystal panels 200, a dichroic prism 400, a projection lens 300, and a housing 500. This is a so-called three-plate projection display device having a single liquid crystal panel.
The structures of the light source devices 10R, 10G, and 10B are described above except that the LED chips of the light source devices 10R, 10G, and 10B emit red color light, green color light, and blue color light, respectively. The structure is basically the same as that of the light source device 10. Therefore, red (R) light from the light source device 10R, green light (G) from the light source device 10G, and blue light (B) from the light source device 10B are emitted. Not only the light source devices 10R, 10G, and 10B that emit RGB color light but also a light source device that emits white light is used, and between the light source device 10 and the liquid crystal panel 200 or between the liquid crystal panel 200 and the dichroic prism 400. A color filter for converting white light into RGB color lights may be disposed between the two.
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 a light-modulated image for each RGB and emit the image toward the projection lens 300. It is configured.

  In the projection display device having such a configuration, each light source device 10R, 10G, and 10B emits high-luminance color light, and is light-modulated by the liquid crystal panel 200 corresponding to each light source device. The light-modulated color lights are synthesized 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 as compared to the single-plate projection display device 1 described above.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the description has been made by adapting the configuration using the LED chip as the light source device. However, the present invention is not limited to the configuration using the LED chip, and is applicable to various other solid-state light emitting devices such as a semiconductor laser. Is something that can be done.
Further, although the description has been made in conformity with the configuration in which the cooling fins are used as the heat radiating means, various means for enhancing the heat radiating effect such as using a cooling element using the Peltier effect can be applied. Further, in the above-described embodiment, the description has been made in conformity with the configuration using the transmissive liquid crystal panel as the light modulation means. However, the present invention is not limited to the configuration using the transmissive liquid crystal panel, and the reflective liquid crystal panel (LCOS) Other light modulation means such as a digital micromirror device (DMD, registered trademark) can be used.

It is the schematic of the light source device which is embodiment in this invention. It is a top view of the light source part of a light source device. It is sectional drawing of the light source part of a light source device. It is a plane schematic diagram of the lower surface cooling part of a light source part. It is a plane schematic diagram of the upper surface cooling part of a light source part. It is an expanded sectional view of a LED chip mounting part. It is the schematic of the light source device which is another embodiment in this invention. It is the schematic of the light source device which is another embodiment in this invention. It is a schematic block diagram of the projection type display apparatus using the light source device of this invention. It is a schematic block diagram of the projection type display apparatus using the light source device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Projection type display apparatus 10, 10R, 10G, 10B ... Light source device, 21 ... LED chip (solid light source), 31 ... 1st flow path (flow path), 31a, 36a ... heat exchange surface, 36 ... second flow path (flow path), 50 ... liquid (liquid medium), 56 ... circulation pump (circulation means), 57 ... cooling fin (heat radiation) Means), 200 ... Liquid crystal panel (light modulation means), 300 ... Projection lens (projection means)

Claims (11)

A solid light source that emits light, a liquid medium that takes away heat generated by the solid light source, and a flow path through which the liquid medium flows,
The light source device, wherein the flow path is arranged to exchange heat with one surface and the other surface of the solid light source.   The light source device according to claim 1, wherein the flow path is provided with heat radiating means for performing heat exchange between the liquid medium and a medium outside the flow path. In the region where the flow path is in heat exchange with the solid state light source,
The light source device according to claim 1, wherein a heat exchange surface of the flow path is wider than the one surface or the other surface.   4. The light source device according to claim 1, wherein a refractive index of the flow path and the liquid medium is substantially the same as a refractive index of a medium existing around the flow path.   The flow rate of the liquid medium flowing in the flow path for exchanging heat with the one surface is different from the flow rate of the liquid medium flowing in the flow path for exchanging heat with the other surface. 5. The light source device according to any one of 4 to 4.   6. The liquid medium flowing in the flow path that exchanges heat with the one surface and the liquid medium flowing in the flow path that exchanges heat with the other surface are different from each other. A light source device according to claim 1. The flow path is a circulation flow path;
The light source device according to claim 1, wherein the circulation channel is provided with a circulation means for circulating the liquid medium. The circulation channel is formed with a first channel that exchanges heat with the one surface and a second channel that exchanges heat with the other surface,
The light source device according to claim 7, wherein the first flow path and the second flow path are connected in parallel. The circulation channel is formed with a first channel that exchanges heat with the one surface and a second channel that exchanges heat with the other surface,
The light source device according to claim 7, wherein the first flow path and the second flow path are connected in series. The channel is a first circulation channel that exchanges heat with the one surface, and a second circulation channel that exchanges heat with the other surface,
The light source device according to any one of claims 1 to 6, wherein a circulation means for circulating the liquid medium is provided in the first circulation channel and the second circulation channel. A projection type display device comprising: a light source device that emits light; a light modulation unit that modulates light from the light source device; and a projection unit that projects light modulated by the light modulation unit,
A projection display device, wherein the light source device is the light source device according to claim 1.

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