JP2004117791A - Projection display device - Google Patents

Abstract

A projection type display device such as a liquid crystal projector is desired to be further reduced in size and weight, but a space for arranging a circuit board is limited, so that a space cannot be effectively used. SUMMARY OF THE INVENTION It is an object of the present invention to enable a substrate to be mounted on a head unit of an optical engine, to effectively utilize space, and to reduce the size.
In a projection display device including a light guide unit that causes different color lights to enter a plurality of light valves (liquid crystal panels) and a combining prism that combines the color lights emitted from the light valves, the light valves are driven. A circuit board for control is composed of a main board and a sub-board. The main board is disposed on the upper surface of the light guide means, and a portion facing the optical head unit is cut off. A projection display device disposed on the upper surface of the device and electrically connected to the main substrate.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention disperses light from a light source into three primary color lights, irradiates the light to three corresponding liquid crystal light valves, combines light emitted from each liquid crystal light valve by a combining prism, and combines the combined images. The present invention relates to a projection display device that projects light, and more particularly to a projection display device in which a circuit board on which a driving circuit for a liquid crystal light valve and the like are formed is improved.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, liquid crystal projectors have been widely used as projection display devices. This liquid crystal projector irradiates light from a light source to a liquid crystal light valve (for example, a transmission type liquid crystal panel), and drives the liquid crystal panel based on a television signal or an information signal from a personal computer or the like, thereby modulating the liquid crystal panel. The projected image is projected on a screen via a projection lens.
[0003]
In the case of a color display projection device, three liquid crystal panels are provided, and light (white light) from a light source is separated into three primary colors of R (red), G (green), and B (blue) using a dichroic mirror. Then, the R, G, and B lights are radiated to the R, G, and B liquid crystal panels, respectively, and the modulated R, G, and B lights are emitted from the respective liquid crystal panels. The image is enlarged and projected on the screen via.
[0004]
On the optical path from the light source to the liquid crystal panel, in addition to the above-described dichroic mirror, optical components such as a relay lens and a condensing lens are arranged.These optical components and the liquid crystal panel are arranged in an optical box, and from outside. To prevent dust and dirt from adhering. In addition, in the liquid crystal projector, air from the outside is blown to the heat generating portion through a fan and an air path in order to cool the liquid crystal panel and the light source, and a cooling space is provided around the liquid crystal panel. I have.
[0005]
Further, a circuit board on which a circuit for processing a video signal to be supplied to the liquid crystal panel and performing various controls of the liquid crystal projector is printed and wired is mounted on an upper surface, a side surface, or the like of the optical box. For example, Japanese Patent No. 3201398 describes an example in which substrates constituting digital circuits and analog circuits are attached to the top and side surfaces of an optical box. In the case of this prior art, no circuit board is arranged above a head unit composed of a synthetic prism and a liquid crystal panel in order to ensure cooling and maintainability.
[0006]
Further, the circuit board and the liquid crystal panel are generally connected by a flexible flat cable and a connector, and the flat cable extending from the liquid crystal panel is connected to the circuit board. A connector is installed at the location.
[0007]
However, there is a demand for a further reduction in size and weight of the liquid crystal projector due to mobile use and the like, and the optical engine is becoming very small. In addition, despite the fact that the outer shape of the set of the projector is reduced as much as possible, the area of the upper part of the head unit needs to be surrendered as a space. There was a limit.
[0008]
In particular, recently, the number of pixels of the liquid crystal panel has been increasing, and at the present time, high performance and high performance are desired, the circuit scale is also large, and as a result, it is a great hindrance to reducing the size and weight of the entire set. Was.
[0009]
[Patent Document 1]
Japanese Patent No. 3201398 (pages 3 to 5, FIGS. 2 and 9)
[0010]
[Problems to be solved by the invention]
As described above, the conventional liquid crystal projector cannot effectively utilize the space above the head unit, has poor space efficiency, and hinders miniaturization of the entire set.
[0011]
In view of the above circumstances, the present invention improves the circuit board layout, reduces the size of the entire set, facilitates the connection between the liquid crystal panel and the circuit board, and cools down the light valve and provides a projection type display with excellent maintainability. It is intended to provide a device.
[0012]
[Means for Solving the Problems]
According to the first aspect of the present invention, a light modulating means including a plurality of light valves, a light guide means for causing different color lights to enter the plurality of light valves, and a color light emitted from the plurality of light valves are combined. A projection display device that includes a synthesis prism and a circuit board on which a circuit for driving and controlling the plurality of light valves is printed and wired, and projects and displays light synthesized by the synthesis prism.
A first circuit board disposed on an upper surface of the light guide means and having a portion cut away from an optical head unit including the light modulating means and the combining prism; A projection display device comprising: a second circuit board disposed on an upper surface of a prism and electrically connectable to the first circuit board.
[0013]
According to a second aspect of the present invention, there is provided a spectral unit that splits light emitted from a light source into three primary color lights, and a plurality of light valves into which the three primary color lights are respectively incident. A light-modulating unit that emits light, a combining prism that combines the color lights emitted from the plurality of light valves, and a projection-type display device that includes a projecting unit that projects the light combined by the combining prism.
Further, a light guide for guiding the light separated by the light separating means to each of the plurality of light valves, and a circuit board on which a circuit for driving and controlling the light valves is printed and wired,
A first circuit board disposed on an upper surface of the light guide section and having a portion facing the optical head unit section including the light modulating means and the combining prism cut off; A projection display device comprising a second circuit board arranged on an upper surface and electrically connectable to the first circuit board.
[0014]
According to the above invention, the second circuit board can be arranged on the combining prism which was a dead space, so that the space can be effectively utilized and the whole set can be downsized. The present invention described in Item 12 includes a light source, spectral means for separating light from the light source into three primary color lights, and a plurality of light valves to which the primary color lights separated by the spectral means are respectively incident. Light modulating means for emitting color light modulated from the light source, a light guide for guiding the primary color light separated by the light splitting means to the plurality of light valves, and combining the color light emitted from the plurality of light valves. Having a combining prism, and projection means for projecting the light combined by the combining prism,
Further, a circuit board on which a circuit for driving and controlling the light valve is printed and wired, and a blowing unit for blowing cooling air to the liquid crystal panel,
A first circuit board disposed on an upper surface of the light guide section and having a portion facing the optical head unit section including the light modulating means and the combining prism cut off; A second circuit board disposed on the upper surface and electrically connectable to the first circuit board, and a gap is formed between the first circuit board and the second circuit board; The cooling display device according to claim 1, wherein the cooling air from the blower is guided from the lower surface of the liquid crystal panel to the gap.
[0015]
According to the present invention, it is possible to arrange the second circuit board on the synthetic prism which has been a dead space, and it is possible to effectively use the space and cool the light valve.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A and 1B show a liquid crystal projector which is an embodiment of a projection display device of the present invention. FIG. 1A is a plan view of an optical engine part, and FIG. 1B is a front view showing a structure of a liquid crystal panel.
[0017]
FIG. 1A shows an example of a three-panel liquid crystal projector having light valves (liquid crystal panels) for R (red), G (green), and B (blue), and 100 is an optical box. A lamp house 200 is provided near the box. In the lamp house 200, a lamp 3 including an arc tube 1 and a reflector 2 is disposed as a light source, and light emitted from the arc tube 1 is reflected by the reflector 2 to generate UV / IR (ultraviolet / infrared light). ) The light is guided to the fly-eye lens 5 through the removal filter 4.
[0018]
The light passing through the fly-eye lens 5 is supplied to a dichroic mirror 8 via a condenser lens 6 and a reflection mirror 7. The dichroic mirror 8 splits the light from the lamp 3 into R light and GB light, and the separated R light is reflected by the mirror 9 and is irradiated on the R liquid crystal panel 11 via the field lens 10.
[0019]
The GB light separated by the dichroic mirror 8 is separated into G light and B light by the dichroic mirror 12, the G light is applied to the G liquid crystal panel 14 via the field lens 13, and the B light is transmitted to the relay lens 15. The liquid crystal panel 20 for B is irradiated via the reflection mirror 16, the relay lens 17, the reflection mirror 18 and the relay lens 19.
[0020]
Further, the R light, G light, and B light transmitted through each of the liquid crystal panels 11, 14, and 20 are combined by the dichroic prism 21, and the combined image light is projected onto a screen (not shown) by the projection lens 300. I have to.
[0021]
By driving the R, G, and B liquid crystal panels 11, 14, and 20 with the R, G, and B primary color signals in this manner, a color image can be projected. Polarizing plates are arranged on the incident side and the exit side of the liquid crystal panels 11, 14, and 20, respectively, and a light valve for three primary colors is configured by utilizing the polarization and the optical rotation of the liquid crystal. .
[0022]
As described above, the liquid crystal projector includes the blocks of the optical box 100, the lamp house 200, and the projection lens 300, and the optical system (commonly called “optical engine”) of the liquid crystal projector is generally configured with three blocks.
[0023]
On the other hand, in the projection display device of the present invention, for example, fans 22 and 23 are used to cool the lamp 3, the liquid crystal panel, and the like. That is, a first fan 22 that introduces outside air to the liquid crystal panels 11, 14, and 20 to blow cooling air, and a second fan 23 that exhausts the wind blown to the lamp 3 to the outside of the projector. Is provided.
[0024]
In addition, the fan that circulates the cooling air in the projector is not limited to the first and second fans 22 and 23, and may be provided in another portion, or may be provided on a side surface or a bottom surface of the projector. Further, an air path (duct) is provided so that cooling air from the blower fan flows smoothly through the heat generating portion, and the cooling air flows from the lower side to the upper side of the liquid crystal panels 11, 14, and 20 through this air path. (Not shown in the figure).
[0025]
The above-described optical engine is stored in the set housing 400 together with the cooling fans 22 and 23, a power supply circuit (not shown), and a lamp lighting circuit.
[0026]
FIG. 1B shows the structure of the liquid crystal panels 11, 14, and 20, and the liquid crystal panel 14 will be described here as a representative. That is, the liquid crystal panel 14 surrounds the periphery of the panel main body display section 141 in which the liquid crystal is sealed by the panel frame 142, and the panel frame 42 is screwed to the entrance surface of the synthetic prism 21 using the mounting holes 143. It has become. Alternatively, it is formed integrally with the synthetic prism 21 using a UV curing resin or the like.
[0027]
A flexible flat cable 144 extends from an upper portion of the panel frame 142, and a plurality of wiring patterns 145 required for driving the liquid crystal are formed in parallel on the cable 144, and the cable terminals 146 of the cable 144 are formed using connectors. Are connected to a circuit board (indicated by a chain line 30) on which a circuit for generating a signal for driving liquid crystal is formed.
[0028]
On the other hand, FIG. 2 shows a configuration of the circuit board 30 mounted on the optical box 100. The optical box 100 constitutes light guide means for dispersing the light from the lamp 3 into R, G, and B lights and guiding the light to the liquid crystal panels 11, 14, and 20, and the circuit board 300 includes the light guide. It is located on the upper surface of the means.
[0029]
In FIG. 2A, a circuit board 30 is printed and wired with a circuit for controlling the driving of the liquid crystal panel, for example, a video signal processing circuit and a circuit for performing various controls of a liquid crystal projector. It comprises a certain main board 31 and a sub-board 32 which is a second circuit board. The main substrate 31 is cut away at a position corresponding to a head unit portion composed of the liquid crystal panels 11, 14, 20 and the synthetic prism 21 to provide a space 311. The sub-substrate 32 is disposed in this space, and is detachably attachable to the main substrate 31 so as to cover the upper part of the combining prism 21.
[0030]
Connectors 312, 313, and 314 are attached to three edges along the space 311 of the main board 31 near the liquid crystal panels 11, 14, and 20, respectively. , 20 (see FIG. 1b). A connector 315 for connection to the sub-substrate 32 is provided on the remaining edge of the space 311 (the edge located on the exit side surface of the combining prism). Further, two holes 316 and 317 are formed in the edge of the space 3111 near both ends of the connector 313.
[0031]
As shown in FIG. 2B, the sub-substrate 32 is provided with a terminal group 321 inserted into the connector 315 and pins 322 and 323 for holders inserted into the holes 316 and 317. The main board 31 and the sub-board 32 are electrically connected by the terminal group 321 and the connector 315, and the sub-board 32 is held on the main board 31 by inserting the pins 322 and 323 into the holes 316 and 317. It has become so.
[0032]
FIG. 3 shows a state in which the circuit board 30 of FIG. 2 is attached to the optical engine unit of FIG. 1, and the space 311 is positioned above the optical head unit.
[0033]
Since the main board 31 and the sub-board 32 have the above-described configuration, the connectors 312, 313, and 314 can be connected to the cable terminals 146 of each liquid crystal panel with the sub-board 32 removed. Work space for the passage of air can be sufficiently secured. Thereafter, when the sub-substrate 32 is attached to the main substrate 31, electrical connection between the two substrates can be established, and a space through which cooling air flows can be secured on the upper surfaces of the liquid crystal panels 11, 14, and 20.
[0034]
That is, the space portion 311 is provided (in a reverse convex shape in the figure) corresponding to the head unit portion including the liquid crystal panels 11, 14, 20 and the combining prism 21, and the sub-substrate 32 is provided with the combining device. Since the sub-substrate 32 is disposed in the space 311, a gap (see FIG. 2A) is formed between the main substrate 31 and the sub-substrate 32. Since it is formed on the upper surfaces of the liquid crystal panels 11, 14, and 20, a space in which cooling air flows can be secured. The sub-substrate 32 can be detachably attached to the main substrate 31 so as to cover the upper part of the combining prism 21.
[0035]
Further, since the sub-substrate 32 is configured to be detachable from the main substrate 31, even if dust or the like adheres to the effective display surface of the light valve, the dust can be easily removed simply by removing the sub-substrate 32. Work becomes possible.
[0036]
In this way, it is possible to arrange a circuit for driving the liquid crystal and the like in the space on the synthetic prism, which has been a dead space in the past, and it is possible to effectively utilize the space and to reduce the size of the entire set. it can.
[0037]
Further, by inserting the pins 322 and 323 provided on the sub-board 32 into the holes 316 and 317 of the main board 31, the sub-board 32 can be held on the main board 31, and the pins 322 are inserted into the holes 316 and 317. By aligning the positions, the sub-board 32 can be positioned, thereby preventing the insertion direction from being mistaken.
[0038]
Next, a second embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 3, since the sub-substrate 32 is configured to be detachable, if the sub-substrate 32 is removed, the circuit connection is cut off and the liquid crystal cannot be driven. Therefore, when performing maintenance while driving the liquid crystal, another jig such as an extension cable is required.
[0039]
Therefore, in the embodiment of FIG. 4, the sub-substrate 32 is not a detachable type but a flip-up type. That is, in the embodiment of FIG. 4, the terminal group 322 connected to the connector 315 ′ is formed of a conductive material having a spring property, while the holder is provided on the main board 31 where the holes 316 and 317 are provided. A holding spring 319 is provided in the holder 318, and the other end of the main board 31 is inserted and fixed against the spring force of the holding spring 319.
[0040]
It is also possible to connect the holder 318 to the ground pattern of the substrate 31 and use it for ground wiring of the sub-substrate 32. In this case, it is possible to ensure both strength and conduction conditions.
[0041]
FIG. 5 shows a third embodiment of the present invention, in which the connector 315 is configured to be rotatable, and the main board 31 and the sub-board 32 are connected by a commercially available rotary connector 315 ″. It is. The other end of the second substrate is held on the main substrate 31 using the pin structure (322, 323) of FIG. 2B. It should be noted that, in practice, the above embodiments can be combined in accordance with required conditions and assumed environments.
[0042]
As described above, when the sub-board 32 is connected to the main board 32 by a flip-up type or a rotary connector, the maintenance work can be performed in a state where both the boards 31 and 32 are electrically connected. Can be used to check the adjustment.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to arrange a part of the circuit in an arbitrary range above the optical head unit, and it is possible to improve space efficiency and maintainability.
[Brief description of the drawings]
FIG. 1 is a plan view and a front view illustrating a configuration of an optical engine and a liquid crystal panel of a projection display device according to an embodiment of the present invention.
FIGS. 2A and 2B are a plan view and a side view illustrating a circuit board shape used in a projection display device according to an embodiment of the present invention. FIGS.
FIG. 3 is a plan view showing a state where the circuit board of FIG. 2 is attached to the optical engine of FIG. 1;
FIG. 4 is a side view illustrating a configuration of a main part of a projection display device according to another embodiment of the present invention.
FIG. 5 is a side view illustrating a configuration of a main part of a projection display device according to still another embodiment of the present invention.
[Explanation of symbols]
100 optical box 200 lamp house 300 projection lens 400 housing 3 lamp (light source)
11, 14, 20 ... Light valve (liquid crystal panel)
144 Flexible flat cable 146 Connector terminal 21 Synthetic prism 30 Circuit board 31 First board 32 First board 311 Spaces 312, 313, 314, 315 Connectors 316, 317 Holes (guides) )
321, terminal groups 322, 323, pins (holders)
322 flexible terminal group 318 retainer 315 '' rotary connector

Claims (12)

A light modulating means including a plurality of light valves, a light guide means for causing different color lights to enter the plurality of light valves, a combining prism for combining the color lights emitted from the plurality of light valves, and the plurality of light valves A circuit for driving and controlling a printed circuit board is provided, and the projection type display device that projects and displays the light combined by the combining prism,
The circuit board,
A first circuit board, which is disposed on the upper surface of the light guide means and has a portion cut away from an optical head unit including the light modulating means and the combining prism, and an upper surface of the combining prism. A projection type display device comprising: a second circuit board arranged and electrically connectable to the first circuit board. Light splitting means for splitting light emitted from the light source into three primary color lights, light modulating means including a plurality of light valves to which the three primary color lights are respectively incident, and respectively emitting color light modulated from the respective light valves; In a projection display device having a combining prism that combines the color lights emitted from the light valves, and a projection unit that projects the light combined by the combining prism,
Further, a light guide for guiding the light separated by the light separating means to each of the plurality of light valves, and a circuit board on which a circuit for driving and controlling the light valves is printed and wired,
A first circuit board disposed on an upper surface of the light guide section and having a portion facing the optical head unit section including the light modulating means and the combining prism cut off; A projection display device comprising a second circuit board disposed on an upper surface and electrically connectable to the first circuit board. 3. The projection display device according to claim 2, wherein one end of the second circuit board is connected to the first circuit board by a connector. 4. The projection type according to claim 3, wherein one end of the second circuit board is connected to the first circuit board by a connector, and the second circuit board is detachably attached to the first circuit board. Display device. 4. The second circuit board, one end of which is connected to the connector by a flexible terminal, and the other end of which is rotatably attached to the first board. Projection display device. The second circuit board has one end connected to the first circuit board by a rotary connector, and the other end rotatably attached to the first board. The projection display device according to claim 3. One end of the second circuit board is connected to the first circuit board by a connector, and the other end of the second circuit board is capable of contacting the first circuit board. 4. The projection type display device according to claim 3, wherein an arbitrary wiring pattern is formed. The second circuit board has one end connected to the first circuit board by a connector, and has holding means for holding the other end to the first board. The projection display device according to claim 3. 9. The projection display device according to claim 8, wherein said holding means includes a guide member formed on said first circuit board. The plurality of light valves include liquid crystal panels, each liquid crystal panel has a flexible flat cable for external connection, and a plurality of second connectors provided with terminals of each flexible flat cable on the first substrate. 3. The projection display device according to claim 2, wherein the projection type display device is connected to the display device. The projection display device according to claim 10, wherein the plurality of second connectors are provided on an edge of the first circuit board along the cutout. The light source includes a light source, a light splitting unit that splits light from the light source into three primary color lights, and a plurality of light valves into which the primary color light split by the light splitting unit is incident, and emits modulated color light from each of the light valves. Light modulating means, a light guide for guiding each of the primary color lights separated by the light separating means to the plurality of light valves, a combining prism for combining the color lights emitted from the plurality of light valves, and the combining prism And projection means for projecting the light synthesized by
Further, a circuit board on which a circuit for driving and controlling the light valve is printed and wired, and a blowing unit for blowing cooling air to the liquid crystal panel,
A first circuit board disposed on an upper surface of the light guide section and having a portion facing the optical head unit section including the light modulating means and the combining prism cut off; A second circuit board disposed on the upper surface and electrically connectable to the first circuit board, and a gap is formed between the first circuit board and the second circuit board; A projection type display device, wherein cooling air from the blowing means is guided from a lower surface of the liquid crystal panel to the gap.

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