JP2017003676A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device capable of smoothly dissipating heat of a light source without affecting a light modulation element.SOLUTION: A housing 150 housing a light distribution member has first to third substrates mounted with each light source and an optical modulation element 130 generating image light showing a display image fitted onto a first wall, a second wall and a third wall 153 being outer walls, the first to third substrates and the housing 150 are formed of a member having high heat conductivity, and a spacer 170 formed of a resin material having heat conductivity lower than that of the housing 150 is arranged between the housing 150 and the optical modulation element 130.SELECTED DRAWING: Figure 5

Description

The present invention relates to a projection display device that can dissipate heat generated by a light source more smoothly.

A projection display device is a device that projects image light (projection light) emitted from an illumination optical system onto a screen or the like. The light source, which is the main element of the illumination optical system, is also a heating element, and measures for heat dissipation are required. In view of this, a projection display device in which various heat dissipation measures have been taken has been proposed (see, for example, Patent Document 1 (FIGS. 2 and 5)).

As shown in FIG. 5 of Patent Document 1, the projection display device (100) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) includes a light source (121) and the light source ( 121), a cover plate (107) covering the casing (103), and a light source heat dissipating member (104) attached to the cover plate (107). The heat generated by the light source (121) is radiated to the atmosphere through the light source heat radiating member (104).

However, as shown in FIG. 2 of Patent Document 1, the light source heat radiating member (104) is sufficiently large based on the size of the projection display device (100). Since the light source heat radiating member (104) is large, the projection display (100) inevitably increases in size, increases in mass, and increases in product cost.

In contrast, in Japanese Patent Application No. 2015-103140, the present applicant is attached to a substrate on which a light source is mounted, a housing to which the substrate is attached, a light distribution member housed in the housing, and the housing. There has been proposed a projection display device that includes a light modulation element, in which a substrate and a housing are configured with members having high thermal conductivity, and heat from a light source is also radiated from the housing through the substrate.

JP 2014-149369 A

However, in the projection display device proposed by the present applicant in Japanese Patent Application No. 2015-103140, the heat from the light source is easily transmitted to the light modulation element attached to the housing, which affects the operation of the light modulation element. There was a risk of effects.

An object of the present invention is to provide a projection display device that can smoothly radiate heat without affecting a light modulation element.

In the projection display device of the present invention, a first substrate on which a red light source is mounted, a second substrate on which a green light source is mounted, a third substrate on which a blue light source is mounted, and these first to third substrates are attached. A housing, a light distribution member housed in the housing, and a light modulation element attached to the housing; and light emitted from the red light source, the green light source, and the blue light source into the housing. A projection display device that distributes light by the light distribution member, converts the distributed light into a predetermined display image by the light modulation element, and projects the image to the outside of the housing, wherein the first to third substrates and The casing is made of a member having high thermal conductivity, and is made of a resin material having lower thermal conductivity than the casing, and includes a spacer disposed between the casing and the light modulation element. It is characterized by that.

In the present invention, smooth heat dissipation can be achieved without affecting the light modulation element.

It is a figure which shows the structure of the head-up display by which the projection type display apparatus which concerns on this invention is mounted. It is a figure which shows the example of a structure of the projection type display apparatus of FIG. It is a disassembled perspective view of the projection type display apparatus of FIG. It is a perspective view of the projection type display apparatus of FIG. 1 assembled. It is sectional drawing of the light modulation element module of FIG.

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

As shown in FIG. 1, the projection display device 100 is applied to, for example, a head-up display 1 mounted on a vehicle. Such a head-up display 1 includes a projection display device 100 that generates image light L, a screen 200 that receives the image light L generated by the projection display device 100 and displays an image (real image), and a screen 200. A plane mirror 300 (relay optical system) that reflects the image light L emitted from the mirror, and a concave mirror 400 (relay optical system) that reflects the image light L reflected by the plane mirror 300 toward the front windshield (transmission reflection portion) 2. The projection display device 100, the screen 200, the plane mirror 300, and the case body 500 that houses the concave mirror 400 are configured, and the virtual image V is displayed forward through the front windshield 2 when viewed from the user. The user can visually recognize the virtual image V by placing the viewpoint 3a in the eye box 3 which is a predetermined area generated by the head-up display 1.

FIG. 2 is a diagram illustrating an example of the configuration of the light distribution member of the projection display apparatus 100. The projection display apparatus 100 includes a red light source 111 that emits red light R, a green light source 112 that emits green light G, a blue light source 113 that emits blue light B, and a light distribution member that distributes light R, G, and B. 120, a light modulation element 130 that converts the distributed light into image light L, and a light projecting lens 140 that forms an image on the screen 200 of the image light L from the light modulation element 130.

The light distribution member 120 includes, for example, dichroic mirrors 121 and 122, a convex lens 123, a prism 124, and the like.

The red light R passes through the dichroic mirror 121 and is reflected by the dichroic mirror 122, and the reflected light travels toward the convex lens 123. The green light G is reflected by the dichroic mirror 121, and the reflected light is further reflected by the dichroic mirror 122 and travels toward the convex lens 123. The blue light B passes through the dichroic mirror 122, and the transmitted light goes to the convex lens 123.

Light rays R, G, and B are distributed by the convex lens 123, pass through the prism 124, and reach the light modulation element 130. The light modulation element 130 converts the light into a predetermined image light L. The converted image light L is reflected by the prism 124, and the reflected image light L is projected (emitted) through the light projection lens 140.

The light source 110 that emits the light beams R, G, and B is preferably a light emitting diode that generates less heat than a conventional light bulb. However, even light emitting diodes generate heat. It is required to promote exhaust heat and suppress the temperature rise of the light source 110.

FIG. 3 is an exploded perspective view of the projection display apparatus 100.
As shown in FIG. 3, the projection display device 100 includes a housing 150 that houses the light distribution member 120 described in FIG. 1, and a red light source (FIG. 1, reference numeral attached to the first wall 151 of the housing 150. 111), a second substrate 112a mounted on the second wall 152 of the housing 150 and mounting a green light source (FIG. 1, reference numeral 112), and mounted on the second wall 152 of the housing 150. A third substrate 113a on which the blue light source (FIG. 1, reference numeral 113) is mounted, and a light modulation element module 160 including the light modulation element 130 and attached to the third wall 153 of the housing 150.

The housing 150 accommodates the light distribution member 120 inside, and is made of a resin containing filler or metal to which a filler having high thermal conductivity is added. The housing 150 includes, for example, a rectangular first wall 151, a second wall 152, and a third wall 153 in a part of the outer wall. In addition, the light distribution member 120 accommodated in the housing | casing 150 is not restricted to what was mentioned above, You may add or abbreviate | omit suitably.

The first wall 151 of the housing 150 includes a rectangular first window 151a, the second wall 152 includes a rectangular second window 152a and a third window 152b, and the third wall 153 includes: A rectangular fourth window (not shown) is provided. A first substrate 111 a is attached to the first wall 151, and a red light source 111 mounted on the first substrate 111 a is disposed on the first window portion 151 a so as to face the inside of the housing 150. In addition, the second substrate 112a and the third substrate 113a are attached to the second wall 152, and the second window portion 152a and the third window portion 152b are mounted on the second substrate 112a and the third substrate 113a. The light source 112 and the blue light source 113 are arranged so as to face the inside of the housing 150. Further, a light modulation element module 160 (to be described later) is attached to the third wall 153, and the light modulation element 130 in the light modulation element module 160 is attached to the casing 150 in the fourth window provided on the third wall 153. It is arranged to face the inside.

Note that the shape of the housing 150 is arbitrary. Further, the three substrates 111a, 112a, and 113a may all be attached to a common wall, for example, the second wall 152, or the three substrates 111a, 112a, and 113a may be attached to different walls. That is, the layout of the three substrates 111a, 112a, and 113a with respect to the housing 150 is arbitrary.

As shown in FIG. 4, the projection display apparatus 100 is fixed to the apparatus base 510 with screws M1. Note that the projection display device 100 may be bonded and fixed to the device base 510. The device base 510 is a part of the case body 500 that houses the projection display device 100 of the head-up display 1, the screen 200, the optical members (plane mirror 300, concave mirror 400), and the like, and is made of metal made of aluminum alloy or carbon steel. It is desirable that The first to third substrates 111a, 112a, 113a are detachably attached to the housing 150 with screws M2.

The first to third substrates 111a, 112a, and 113a are made of filler-containing resin or metal to which a filler having high thermal conductivity is added. The front surfaces of the first to third substrates 111a, 112a, and 113a (surfaces on which the light sources 1101, 112, and 113 are mounted) are covered with an insulating layer that is rich in electrical insulation. There is no insulating layer. All of the regions around the light source 110 without the insulating layer are in contact with the first wall 151 and the second wall 152 of the housing 150, respectively.

The heat of the light source 110 is transmitted to the first to third substrates 111a, 112a, and 113a, respectively. The heat of the first to third substrates 111a, 112a, 113a is transmitted to the housing 150. Specifically, the first to third substrates 111a, 112a, and 113a that are in contact with the first wall 151 and the second wall 152 of the housing 150 are efficiently transmitted to the housing 150 from the regions where the insulating layers are not provided. The heat of the housing 150 is radiated to the atmosphere by convective heat transfer. At this time, since the first to third substrates 111a, 112a, 113a and the housing 150 are made of a good heat conductive material, the flow of heat increases. As a result, it is suppressed that the light source 110 becomes high temperature.

As shown in FIG. 4, when the housing 150 is thermally connected to the device base 510, heat is conducted from the housing 150 to the device base 510. The device base 510 is heated by the heat from the light source 110, but the device base 510 is a part of the case body 500 of the head-up display 1 and dissipates heat by convection heat transfer to the atmosphere around the head-up display 1. can do.

That is, the heat of the light source 110 is transmitted to the first to third substrates 111a, 112a, and 113a, and the heat of the first to third substrates 111a, 112a, and 113a is transmitted to the housing 150 through the region without the insulating layer. Then, the heat of the casing 150 is transmitted to the device base 510 and is radiated from the outer surface of the device base 510 to the atmosphere.

  Next, the light modulation element module 160 will be described with reference to FIG. FIG. 5 is a cross-sectional view of the light modulation element module 160 when attached to the third wall 153 of the housing 150. The light modulation element module 160 is formed into a module by assembling the light modulation element 130, the socket 131 that houses the light modulation element 130, the spacer 170, the circuit board 180, the cushion material 190, and the heat removal member 195. The assembled light modulation element module 160 is fixed to the housing 150 with a screw M3.

  The light modulation element 130 is a reflective display device such as DMD or LCOS (registered trademark: Liquid Crystal On Silicon), and a plurality of lands 130a are two-dimensionally arranged on the opposite side (back side) of the reflective surface. The plurality of lands 130a are housed and fixed in the socket 131 so as to be electrically connected to first contacts 131a of the socket 131 described later. The plurality of lands 130a are arranged in a region excluding the central region of the light modulation element 130, and a rectangular heat radiation land 130b is arranged in the central region in order to release heat of the light modulation device 130.

The socket 131 is formed of an insulating resin in a concave shape so that the light modulation element 130 can be accommodated in a substantially central portion, and the concave bottom surface 131b is a flat surface having a rectangular opening 131c in the central region. ing. A plurality of first holes (not shown) are formed on the bottom surface 131b so as to surround the opening 131c, and the conductive first contacts 131a protrude somewhat into the plurality of first holes. So that it is stored. In addition, a plurality of second holes (not shown) are formed on the back surface of the socket 131 so as to surround the opening 131c, and a plurality of first contacts are provided in the plurality of second holes (not shown). A plurality of second contacts 131d electrically connected to 131a are accommodated so as to protrude somewhat. The first contacts 131a are in contact with the lands 130a of the LGA package of the light modulation element 130, and a plurality of second contacts 131d that are electrically connected to the first contacts 131a are in contact with the lands 181 of the circuit board 180. .
The socket 131 has a protrusion 131e, and the protrusion 131e is inserted into a mounting hole 172 of the spacer 170, which will be described later, so that the socket 131 in which the light modulation element 130 is accommodated is positioned on the spacer 170. Note that the positioning unevenness relationship between the socket 131 and the spacer 170 may be reversed. As a positioning method of the socket 131 with respect to the spacer 170, in addition to the uneven fitting, between the members such as screws and engaging claws. May be replaced by positioning by engaging, and the positioning structure itself may be omitted.

  The spacer 170 includes a display hole 171 through which the light beams R, G, and B incident on the light modulation element 130 and the image light L reflected by the light modulation element 130 pass, and a mounting hole 172 into which the protrusion 131e of the socket 131 is inserted. And a through hole 173 through which a screw M3, which will be described later, is inserted, and a boss 175 that is formed with a heat exhaust member 195, which will be described later, and a mounting hole 174 that is fastened by the screw M4, and protrudes toward the heat exhaust member 195. This is a member that contacts the housing 150 when the module 160 is attached to the housing 150. The spacer 170 is a member having a lower thermal conductivity than that of the casing 150, and is formed of, for example, a resin material such as polycarbonate or a low thermal conductivity metal such as stainless steel or titanium. For this reason, since the amount of heat transfer from the housing 150 to the light modulation element 130 can be suppressed, the light source from the housing 150 housing the light distribution member 120 while suppressing the influence of heat generation of the light source 110 on the light modulation element 130. The heat of 110 can be radiated smoothly.

  The spacer 170 adjusts the mounting angle of the light modulation element 130 with respect to the third wall 153 of the housing 150. Specifically, the spacer 170 arranges the light modulation element 130 so that the display surface (reflection surface) of the light modulation element 130 has a predetermined mounting angle that is not parallel to the third wall 153 of the housing 150. . For example, a plurality of types of spacers 170 exist for each vehicle type on which the head-up display 1 is mounted, and the spacers 170 having different mounting angles of the light modulation elements 130 with respect to the third wall 153 are used for each model of the head-up display 1. . As a result, the position of the screen 200 and the relay optical system (plane mirror 300, concave mirror 400) and the angle at which the screen 200 and the relay optical system are arranged in the head-up display 1 have changed due to the different types of vehicles and the different layouts of the devices in the vehicle. Even in such a case, it is possible to adjust the direction of the image light L only by changing the spacer 170, and to form the image on the screen 200 with the angle adjusted reliably. Among them, the light source 110, the light distribution member 120, the light modulation element 130, the light projecting lens 140, the housing 150 and the like can be shared across the models, and the design man-hours for each model can be reduced.

  The circuit board 180 is formed of a hard base material, and a plurality of lands 181 are formed so as to contact the plurality of second contacts 131d of the socket 131, and a rectangular opening 182 is formed in the central region. Furthermore, a positioning hole 183 into which the boss 175 of the spacer 170 is inserted is formed. The circuit board 180 is connected to the control unit by a wiring (not shown), and supplies an electric signal and power from the control unit to the light modulation element 130 via the land 181. The circuit board 180 is pressed against the spacer 170 by the heat exhaust member 195 and the cushion material 190 when a heat exhaust member 195 described later is fastened to the spacer 170 using the screw M4. It is held between the material 190.

  The cushion material 190 is made of, for example, an elastic member such as urethane, and is formed in a shape that covers a contact area where the second contact 131d of the socket 131 and the land 181 of the circuit board 180 are in contact with each other. An opening 191 is formed. The cushion material 190 is disposed between the circuit board 180 and a heat exhaust member 195 described later. When the heat exhaust member 195 is fastened to the spacer 170 using the screw M4, the cushion material 190 is connected to the circuit board 180 and will be described later. The circuit board 180 is pressed against the socket 131 (second contact 131d) side by an elastic force that is compressed between the heat exhaust member 195 and returns to the original shape. With such a configuration, the contact between the land 181 of the circuit board 180 and the second contact 131d of the socket 131 can always be kept good.

  The heat exhaust member 195 is a hard plate-like member disposed on the back side of the cushion material 190, and has a rectangular opening 196 and a plurality of heat dissipating fins projecting on the opposite side of the spacer 170 in the center region. 197 and a through-hole 198 through which a screw M4, which will be described later, is inserted, a screw M4, which will be described later, is inserted into the through-hole 198 and fastened to the spacer 170, The circuit board 180 and the cushion material 190 can be pressed and fixed to the spacer 170 side.

Hereinafter, a method for assembling the light modulation element module 160 in the present embodiment will be briefly described.
(1) The light modulation element 130 is housed and fixed in the socket 131, and the socket 131 is fixed to the spacer 170. (2) The boss 175 of the spacer 170 is inserted into the positioning hole 183 of the circuit board 180 on the back side of the socket 131, and the cushion material 190 is disposed on the back side of the circuit board 180. (3) Fasten to the spacer 170 using the screw M4 from the back side of the heat removal member 195. Thereby, the light modulation element module 160 is assembled. Further, the light modulation element module 160 can be fixed to the casing 150 by inserting a screw M3 through a through hole 173 provided in the spacer 170 of the light modulation element module 160 and screwing the screw M3 to the casing 150. .

  Note that the shapes and fixing structures of the light modulation element 130, the socket 131, the spacer 170, the circuit board 180, the cushion material 190, the heat exhausting member 195, and the like are not limited to the shapes of the above embodiments.

The projection display device of the present invention is suitable for an in-vehicle device mounted on a vehicle.

DESCRIPTION OF SYMBOLS 1 ... Head up display, 2 ... Front windshield (transmission reflection part), 3 ... Eye box 3a ... Viewpoint, 100 ... Projection type display apparatus, 111 ... Red light source 111a ... 1st board | substrate, 112 ... Green light source 112a ... 2nd Substrate, 113 ... Blue light source 113a ... Third substrate, 130 ... Light modulation element, 121 ... Dichroic mirror (light distribution member), 122 ... Dichroic mirror (light distribution member), 123 ... Convex lens (light distribution member), 124 ... Prism (Light distribution member), 150 ... casing, 151 ... first wall, 152 ... second wall, 153 ... third wall, 160 ... light modulation element module, 170 ... spacer, 180 ... circuit board, 190 ... cushioning material, 195 ... Heat exhaust member, 200 ... Screen, 300 ... Plane mirror (relay optical system), 400 ... Concave mirror (relay optical system), 500 ... Case body L ... image light, M1 to M4 ... screw (screws), V ... virtual image

Claims (2)

A first substrate on which a red light source is mounted, a second substrate on which a green light source is mounted, a third substrate on which a blue light source is mounted, a housing to which these first to third substrates are attached, and stored in this housing A light distribution member and a light modulation element attached to the housing, and the light emitted from the red light source, the green light source, and the blue light source into the housing is distributed by the light distribution member, A projection-type display device that converts the distributed light into a predetermined display image by the light modulation element and projects the light outside the casing, wherein the first to third substrates and the casing have thermal conductivity. A projection display device comprising a high member, a resin material having a lower thermal conductivity than the housing, and a spacer disposed between the housing and the light modulation element . The projection display device according to claim 1, wherein there are a plurality of types of spacers for each model, and each type of the spacer has a different mounting angle of the light modulation element with respect to the casing.

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