JP2005134463A - Projection display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device capable of realizing miniaturization and high definition of a light modulation device and improving reliability by preventing malfunction caused by heat generation of an integrated circuit chip.
A liquid crystal light valve of a projection display device includes a liquid crystal panel and a COF substrate connected to one of the substrates. The COF substrate 32 includes a film substrate 33 and a driver IC 34 mounted thereon. The liquid crystal panel 31 is connected to an external control circuit via the COF substrate 32. By providing a part of the driving circuit of the liquid crystal panel in the driver IC 34, the liquid crystal panel can be reduced in size and high definition. The cool air from the cooling fan 71 is guided by the partition plate 90 so as to hit both the liquid crystal panel 31 and the driver IC 34. A malfunction due to heat generation of the driver IC 34 is prevented.
[Selection] Figure 2

Description

  The present invention relates to a projection display device such as a liquid crystal projector.

  As a display device, a projection display device (liquid crystal projector) that projects an image emitted from an optical system using a light modulation device such as a liquid crystal light valve on a screen through a projection lens is known. As a light modulation device of a projection display device, a digital mirror device (Digital Mirror Device) has been put into practical use in addition to a liquid crystal light valve.

  By the way, in the liquid crystal light valve used as the light modulation device of the projection display device as described above, there is a strong demand for cost reduction. For example, in Patent Document 1 below, a driving circuit of a liquid crystal display device or a part thereof is mounted on a substrate holding a liquid crystal, and a switching element for a pixel and a semiconductor element for a driving circuit are manufactured at the same time. A technique for realizing cost reduction is disclosed.

Further, as a conventional projection display device (liquid crystal projector), a technique is known in which air sucked into the device by driving a cooling fan passes through the vicinity of the liquid crystal display panel to cool the liquid crystal display panel (for example, , See Patent Document 2).
Japanese Patent No. 3133248 JP 2000-81673 A

  According to the prior art described in Patent Document 1, it is possible to realize a liquid crystal display device that is superior in terms of reduction in the number of connection wirings, manufacturing efficiency of switching elements, and the like as compared with the case where a drive circuit is provided outside. However, liquid crystal light valves and the like used for projection display devices are strongly demanded for high definition and miniaturization, and there is a problem that it is difficult to realize such a request with the conventional technique described in Patent Document 1. there were.

  In the prior art described in Patent Document 2, since the air sucked into the apparatus by the cooling fan passes through the vicinity of the liquid crystal display panel and cools the liquid crystal display panel, the liquid crystal is displayed on the liquid crystal display panel and the FPC. When used in a structure in which a display panel driving IC is mounted, a cooling structure for cooling the driving IC is required to prevent malfunction due to heat generation.

  The present invention has been made paying attention to the above-mentioned conventional problems, and the object thereof is to realize downsizing and high-definition of the light modulation device, and to prevent malfunction due to heat generation of the integrated circuit chip and to improve reliability. An object of the present invention is to provide a projection display device that can be improved.

  A projection display device according to the present invention includes a light source, a light modulation device that modulates light from the light source, a projection device that projects light modulated by the light modulation device, and a cooling fan. In the apparatus, the light modulation device includes a main body that modulates light from the light source, and a substrate on which an integrated circuit chip is mounted on a flexible substrate, and is connected to an external control circuit via the substrate. The gist is that the cooling air from the cooling fan hits both the main body and the integrated circuit chip.

According to this, since the light modulation device includes the main body portion that modulates light from the light source and the substrate on which the integrated circuit chip is mounted on the flexible substrate, the circuit for driving the main body portion is provided. By providing a part of the integrated circuit chip, it is possible to realize downsizing and high definition of the light modulation device. In addition, since the cool air from the cooling fan hits both the main body portion and the integrated circuit chip of the light modulation device, the temperature rise of the main body portion is suppressed and the temperature rise of the integrated circuit chip is suppressed. Malfunctions due to chip heat generation can be prevented. Therefore, the light modulation device can be reduced in size and definition, and a highly reliable projection display device can be realized.

The gist of the projection type display device is provided with a partition plate that separates the cool air from the cooling fan into the cool air toward the main body and the cool air toward the integrated circuit chip.
According to this, since the cool air from the cooling fan is guided by the partition plate and uniformly hits the integrated circuit chip, the temperature change of the integrated circuit chip can be further suppressed, and the adverse effect of the temperature change on the display is further reduced. can do. Therefore, it is possible to realize a projection display device that is further improved in reliability and capable of high-quality display.

  The gist of the projection display device is that the flexible substrate is assembled to the partition plate so that the integrated circuit chip and the main body of the light modulation device are separated by the partition plate.

  According to this, the integrated circuit chip can be shielded by the partition plate so that light from the light source does not strike the integrated circuit chip. For this reason, the temperature rise of the integrated circuit chip due to light can be suppressed, and a special structure for shielding the integrated circuit chip is not required, and a low-cost projection display device can be realized. Thus, the partition plate functions as an air guide plate that separates the cool air from the cooling fan into the cool air toward the main body side of the light modulation device and the cool air toward the integrated circuit chip and guides it to the integrated circuit chip. It has a function as a light shielding plate for shielding the integrated circuit chip.

The gist of the projection display device is that the integrated circuit chip constitutes at least a part of a drive circuit that outputs an image signal to the light modulation device.
According to this, among the circuits constituting the drive circuit, a circuit that requires high capability can be incorporated into an integrated circuit chip and mounted on the substrate, so that the drive provided in the main body of the light modulation device The circuit load can be reduced to achieve higher definition of the light modulation device, and the capability of the drive circuit can be easily improved.

  In the projection display device, a connection terminal for connecting the substrate and the light modulation device is formed at an end portion on one surface side of the flexible substrate, and the connection terminal and the integrated circuit chip include The gist is that they are provided on the same surface of the flexible substrate.

  According to this, since it is possible to use a substrate in which terminals and circuits are mounted on one side as the substrate, there is no need to use a high-cost substrate that can be mounted on both sides, and a low-cost projection display device is provided. realizable.

[One Embodiment]
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
FIG. 1 is a plan view showing a schematic configuration of a projection display device according to an embodiment, and FIG. 2 shows a part of a structure in which cold air flows in the projection display device.

As shown in FIG. 1, the projection display device 11 of the present embodiment includes transmissive liquid crystal light valves 12, 13, and 14 for different colors of R (red), G (green), and B (blue). This is a three-plate projection type color display device. The projection display device 11 includes a projector body 10 and an illumination device 20.
And a color separation / synthesis system 30 and a projection optical system 40 as a projection apparatus having a plurality of projection lenses.

  The illumination device 20 includes a light source 15, two fly eye lenses 16 and 17, and a polarization conversion device 18. The color separation / combination system 30 includes two dichroic mirrors 21, 22, three reflection mirrors 23, 24, 25, three relay lenses 26, 27, 28, three liquid crystal light valves 12, 13, 14, And a cross dichroic prism 29.

  The light source 15 includes a lamp 20a such as a high-pressure mercury lamp or a metal halide lamp, and a reflector 20b that reflects light L from the lamp 20a (hereinafter referred to as “light source light L”). Further, in order to make the illuminance distribution of the light source light L uniform in the liquid crystal light valves 12, 13, and 14 that are illuminated areas, two fly-eye lenses 16 and 17 are provided. Each of the fly-eye lenses 16 and 17 is composed of a plurality of (for example, 6 × 8) lenses 16a and 17a arranged two-dimensionally. Thus, the liquid crystal light valves 12, 13, and 14 are illuminated with uniform illumination by the fly-eye lenses 16 and 17 with the light source light L.

  The polarization conversion device 18 includes a polarization beam splitter array (PBS array) provided on the fly-eye lens 17 side, and a half-wave plate that converts the polarization direction of polarized light reflected by the PBS array, and is a light source light The polarization direction of light is aligned in one direction without impairing the light intensity of L.

  The dichroic mirrors 21 and 22 are formed, for example, by laminating a dielectric multilayer film having a predetermined wavelength selectivity on a glass substrate. The dichroic mirror 21 transmits the red light LR of the light source light L and reflects the green light LG and the blue light LB. The dichroic mirror 22 reflects the green light LG among the green light LG and the blue light LB reflected by the dichroic mirror 21 and transmits the blue light LB.

  Thereby, in the color separation / combination system 30, the red light LR out of the light source light L incident from the illumination device 20 passes through the dichroic mirror 21, is reflected by the reflection mirror 23, and is then the liquid crystal light valve 12 for red light. Is incident on. The green light LG is reflected by the dichroic mirror 21 and then reflected by the dichroic mirror 22 and enters the liquid crystal light valve 12 for green light. The blue light LB is reflected by the dichroic mirror 21, then passes through the dichroic mirror 22, passes through a relay system including three relay lenses 26 to 28 and two reflection mirrors 24 and 25, and is a liquid crystal light valve for blue light. 14 is incident.

  In the present embodiment, the liquid crystal light valves 12 to 14 as the light modulation devices are configured by active matrix transmissive liquid crystal light valves, and are driven by driving circuits described later based on image signals. It has become.

  The cross dichroic prism 29 has a structure in which a right-angle prism is bonded, and a dielectric multilayer film that reflects the red light LR and transmits the green light LG is formed on one of the two mirror surfaces orthogonal to each other in a cross shape. On the other side, dielectric multilayer films that reflect the blue light LB and transmit the green light LG are formed. Then, the three color lights of the red light LR, the green light LG, and the blue light LB are combined by the cross dichroic prism 29 to form light representing a color image, and this light is enlarged and projected on the screen 41 by the projection optical system 40. It has come to be.

As shown in FIGS. 2 and 3, the liquid crystal light valve (light modulation device) 14 for blue light includes a liquid crystal panel 31 as a main body of the light modulation device that modulates the light source light L, and the liquid crystal panel 31. And a COF substrate 32 connected to one of the substrates. The COF substrate 32 includes a film substrate 33 as a flexible substrate and a driver IC 34 as an integrated circuit chip mounted on one surface side of the film substrate 33. The liquid crystal panel 31 is connected to an external timing control circuit 43 (see FIG. 5) via a COF substrate 32. The liquid crystal light valve 12 for red light and the liquid crystal light valve 13 for green light are configured similarly to the liquid crystal light valve 14 for blue light.

  As shown in FIG. 3, the liquid crystal panel 31 has a liquid crystal layer sandwiched between an element substrate 31a and a counter substrate 31b arranged to face each other, and in a region where the substrates 31a and 31b overlap in a plane. A pixel portion 35 that is a display region is formed. The pixel unit 35 has a plurality of pixels arranged in a matrix.

  Two drive circuits 36 and 37 are mounted on the peripheral portion of the element substrate 31a, and one drive circuit 36 is electrically connected to a plurality of connection portions 38 formed in the vicinity thereof. A terminal for connecting the driver IC 34 and the drive circuit 36 is provided on one end of the film substrate 33 on which the driver IC 34 is mounted, and a connection portion 38 is formed by being connected to a terminal on the element substrate 31a side. doing. Thus, the driver IC 34 and the drive circuit 36 are electrically connected via the connection portion 38.

The liquid crystal light valve 12 for red light and the liquid crystal light valve 13 for green light also have the same configuration as the liquid crystal light valve 14 for blue light described above.
Next, the electrical configuration of each of the liquid crystal light valves 12 to 14 will be described. Here, since the electrical configurations of the liquid crystal light valves 12 to 14 are the same, only the electrical configuration of the liquid crystal light valve 14 for blue light will be described with reference to FIG. The liquid crystal panel 31 of the liquid crystal light valve 14 is provided with a pixel unit 35, a drive circuit (multiplexer) 36, and a drive circuit (Y driver) 37.

  The pixel unit 35 includes a plurality of pixels arranged at positions corresponding to intersections of a plurality of scanning lines and a plurality of data lines extending in directions intersecting each other, and each pixel includes a TFT element and a liquid crystal layer. A pixel electrode opposite to the counter electrode is provided. The plurality of data lines are connected to the drive circuit 36, and the plurality of scanning lines are connected to the drive circuit 37.

  A driver IC 34 is connected to the drive circuit 36 via a signal line group 42. The driver IC 34 and the drive circuits 36 and 37 are connected to a timing control circuit 43 that controls them. The pixel unit 35 is driven and controlled by a driver IC, driving circuits 36 and 37, and a timing control circuit 43.

  Image data DATA, latch timing signal LP, shift register start signal ST, and data clock signal CLX shown in FIG. 4 are supplied from the timing control circuit 43 to the driver IC 34. In addition, selector signals S1, S2, and S3, which are selection signals, are supplied from the timing control circuit 43 to the driver IC 34 and the drive circuit 36. A start signal DY and a line shift signal CLY from the drive circuit (Y driver) 37 are supplied from the timing control circuit 43 to the drive circuit 37.

  The driver IC 34 is provided with a selector that selects and outputs one image signal from the image data DATA. This selector has a configuration in which a shift register, a latch circuit, and a driver circuit are sequentially connected.

The driver IC inputs the image data DATA to the latch circuit, and based on the selector signals S1, S2, and S3 supplied simultaneously, one image corresponding to the selector signal is selected from the plurality of image data DATA accumulated in the latch circuit. Data is selected and output to the drive circuit 36 via the signal line group 42. On the other hand, the drive circuit 36 outputs the image data DATA from the driver IC to the data line of the pixel column corresponding to the selector signals S1, S2, and S3. Then, the TFT elements of the pixels in each row are switched by a gate signal output from the driving circuit 37 to the scanning line in synchronization with the output to the data line, and an image is displayed.

  Next, a cooling structure for applying cold air from a cooling fan to the liquid crystal panels and driver ICs of the three liquid crystal light valves 12 to 14 will be described with reference to FIGS. 1, 2, and 5. FIG. 2 is a diagram showing a part of the structure in which the cool air flows in the projection display device 11 as described above. In FIG. 1, the cross dichroic prism 29 and the liquid crystal light valve 14 for blue light are located near the side. It is the figure seen from the direction. FIG. 5 shows a cooling structure in which cool air from a cooling fan is applied to each driver IC of the liquid crystal light valves 12 to 14.

  A projector body 10 shown in FIG. 1 is a rectangular parallelepiped housing, and the projector body 10 incorporates the above-described illumination device 20, color separation / combination system 30, power supply device 50, and the like. The projector body 10 is provided with two suction ports 51 and 52, two exhaust ports 61 and 62, and two cooling fans 71 and 72.

  The suction port 51 is provided on a side wall close to the relay system of the color separation / combination system 30 among the four side walls of the projector body 10, and a cooling fan 71 is installed in the suction port 51. Another suction port 52 is provided at a position near the three liquid crystal light valves 12 to 14 on the bottom wall of the projector body 10, and a cooling fan 72 is installed in the suction port 52. The exhaust port 61 is provided on the side wall where the projection optical system 40 is provided among the four side walls of the projector body 10. The exhaust port 62 is provided at a position near the power supply device 50 on the side wall opposite to the side wall on which the projection optical system 40 is provided.

  Further, in the projector body 10, an air guide wall 82 that forms a wind passage 81 from the suction port 51 to the exhaust port 61 and a wind passage 83 from the suction port 51 to the power supply device 50 and the exhaust port 62 are formed. A wind guide wall 84 is formed. The air guide walls 82 and 84 are each made of a glass plate or the like.

  Air (hereinafter referred to as “cold air”) sucked upward from the suction port 52 into the projector main body 10 by the cooling fan 72 hits the liquid crystal panels of the liquid crystal light valves 12 to 14, and then is sucked by the cooling fan 71. Along with air sucked into the projector main body 51 from 51 (hereinafter referred to as “cold air”), the air is exhausted from an exhaust port 61 through a wind passage 81. In this manner, the cool air sucked by the cooling fans 71 and 72 strikes the liquid crystal panels of the liquid crystal light valves 12 to 14 to suppress the temperature rise.

  The cool air sucked from the suction port 51 by the cooling fan 71 is changed in direction on the back surface of the reflection mirror 24 and hits the power supply device 50, and then exhausted from the exhaust port 62 through the wind passage 83. Thus, the cold air sucked by the cooling fan 71 strikes the power supply device 50 and suppresses the temperature rise.

  As shown in FIGS. 2 and 5, the cold air sucked by the cooling fans 71 and 72 is supplied to the liquid crystal panels of the liquid crystal light valves 12 to 14 (for example, the liquid crystal panel 31 shown in FIG. 2) and the driver ICs. Both hits. 2 and 5, only the cooling fan 71 is shown.

Specifically, as shown in FIGS. 2 and 5, the cool air from the cooling fans 71 and 72 is separated into cool air toward the liquid crystal panels of the liquid crystal light valves 12 to 14 and cool air toward the driver ICs. A partition plate 90 is provided above the liquid crystal light valves 12 to 14 in the projector main body 10. In FIG. 5, reference numerals 32R, 33R, and 34R denote a COF substrate, a film substrate, and a driver IC of the liquid crystal light valve 12 for red, respectively. Reference numerals 32G, 33G, and 34G denote a COF substrate, a film substrate, and a driver IC of the green liquid crystal light valve 13, respectively.

  As shown in FIGS. 2 and 5, the driver ICs 34R, 34G, 34 of the liquid crystal light valves 12-14 and the liquid crystal panels (for example, the liquid crystal panel 31 shown in FIG. 2) are separated from each other by a partition plate 90. The film substrates 33R, 33G, 33 are assembled to the partition plate 90. A control circuit board 91 having the above-described timing control circuit 43 shown in FIG. 4 is arranged above the partition plate 90.

  The film substrates 33R, 33G, 33 of the liquid crystal light valves 12-14 are passed through through holes 90a-90c provided in the partition plate 90 so as to protrude above the partition plate 90, and the driver ICs 34R, 34G. , 34 are assembled to the control circuit board 91 so as to be electrically connected to the timing control circuit 43.

  With such a cooling structure, the cool air sucked by the cooling fans 71 and 72 strikes both the liquid crystal panels of the liquid crystal light valves 12 to 14 and the driver ICs to suppress the temperature rise.

According to the embodiment configured as described above, the following operational effects can be obtained.
(1) The liquid crystal light valve 14 for blue light includes a liquid crystal panel 31 that modulates the light source light L, and a COF substrate 32 connected to one substrate of the liquid crystal panel 31. The COF substrate 32 includes a film substrate 33 and a driver IC 34 mounted on one surface thereof. The liquid crystal panel 31 is connected to an external timing control circuit 43 through a COF substrate 32. The liquid crystal light valve 12 for red light and the liquid crystal light valve 13 for green also have the same configuration as the liquid crystal light valve 14 for blue light.

  In this way, each of the liquid crystal light valves 12 to 14 modulates the light source light L from the light source 15 and the COF substrates 32R and 32G in which the driver ICs 34R, 34G, and 34 are mounted on the film substrates 33R, 33G, and 33. , 32. For this reason, by providing a part of the circuit for driving each liquid crystal panel in each driver IC, it is possible to realize the miniaturization and high definition of each liquid crystal panel.

  (2) Since the cool air from the cooling fans 71 and 72 hits both the liquid crystal panels (for example, the liquid crystal panel 31) of the liquid crystal light valves 12 to 14 and the driver ICs 34R, 34G, and 34, the temperature of each liquid crystal panel While the rise is suppressed, the temperature rise of each driver IC is also suppressed, and malfunction due to heat generation of each driver IC can be prevented. Therefore, the projection display device 11 with high reliability can be realized.

  (3) Since the cold air from the cooling fans 71 and 72 is guided by the partition plate 90 and uniformly hits each driver IC 34R, 34G, 34, the temperature change of each driver IC can be further suppressed, and the temperature change is displayed. It is possible to reduce the adverse effect on Accordingly, it is possible to realize the projection type display device 11 that further improves the reliability and enables high-quality display.

(4) With the partition plate 90, each driver IC can be shielded from light so that the light source light L from the light source 15 does not hit each driver IC 34R, 34G, 34. For this reason, the temperature rise of each driver IC 34R, 34G, 34 due to light can be suppressed, and a special structure for shielding each driver IC is not required, and the low-cost projection display device 11 can be realized. As described above, the partition plate 90 separates the cool air from the cooling fans 71 and 72 into the cool air toward the liquid crystal panels of the liquid crystal light valves 12 to 14 and the cool air toward the driver ICs 34R, 34G, and 34. It has a function as a wind guide plate for guiding to the driver IC and a function as a light shielding plate for shielding each driver IC.

  (5) Since each of the driver ICs 34R, 34G, 34 constitutes at least a part of a drive circuit that outputs an image signal to each liquid crystal panel of the liquid crystal light valves 12-14, among the circuits constituting the drive circuit, A circuit that requires high capability can be incorporated in each driver IC and mounted on each film substrate 33R, 33G, 33. For this reason, it is possible to reduce the burden on the drive circuit 37 (see FIG. 4) provided in each liquid crystal panel to achieve high definition of each liquid crystal panel, and to easily improve the capability of the drive circuit.

  (6) A connection portion (connection terminal) 38 for connecting the film substrate 33 and a liquid crystal panel (for example, the liquid crystal panel 31) and the driver IC 34 are provided on the same surface of the film substrate 33. For this reason, the board | substrate with which the terminal and the circuit were mounted in the single side | surface side can be used as a board | substrate, and it is not necessary to use the high cost board | substrate which can be mounted in both surfaces, and can implement | achieve a low cost projection type display apparatus.

[Modification]
In addition, this invention can also be changed and embodied as follows.
In the above embodiment, the embodiment in which the present invention is applied to the projection display device 11 having the configuration shown in FIG. 1 is shown as an example. However, the projection display device to which the present invention is applied is shown in FIG. The configuration is not limited. According to the present invention, a light modulation device includes a main body that modulates light from a light source and a substrate in which an integrated circuit chip is mounted on a flexible substrate, and is connected to an external control circuit via the substrate. The present invention can be widely applied to a projection display device having such a configuration.

  In the above embodiment, the projection display device 11 is described as a three-plate projection color display device, but the present invention is also applicable to a projection display device having one liquid crystal light valve.

  In the above embodiment, the suction port 52 is provided on the bottom wall of the projector main body 10 at a position close to the three liquid crystal light valves 12 to 14. However, the suction port 52 is provided on the upper wall of the projector main body 10, You may provide in the position close | similar to the three liquid crystal light valves 12-14.

  In the above embodiment, in addition to the suction ports 51 and 52, another suction port 53 is provided on the side wall where the projection optical system 40 is provided as shown in FIG. A cooling fan 73 may be installed. According to this configuration, it is possible to further suppress the temperature rise of the liquid crystal panels of the liquid crystal light valves 12 to 14 and the driver ICs 34R, 34G, 34.

1 is a plan view showing a schematic configuration of a projection display device according to an embodiment. Explanatory drawing which shows a part of structure where a cold wind flows in the projection type display apparatus of FIG. The perspective view which shows a liquid crystal light valve. The block diagram which shows the electrical constitution of a liquid crystal light valve. The perspective view which shows the cooling structure which applies cold air to each driver IC of three liquid crystal light valves.

Explanation of symbols

  L: Light, 11: Projection type display device, 15: Light source, 31a, 31b ... Substrate, 36, 37 ... Drive circuit, 71, 72, 73 ... Cooling fan, 90 ... Partition plate.

Claims (5)

In a projection display device comprising a light source, a light modulation device that modulates light from the light source, a projection device that projects light modulated by the light modulation device, and a cooling fan,
The light modulation device includes a main body that modulates light from the light source, and a substrate in which an integrated circuit chip is mounted on a flexible substrate, and is connected to an external control circuit via the substrate. And
A projection type display apparatus, wherein the cooling air from the cooling fan hits both the main body and the integrated circuit chip. The projection display device according to claim 1,
A projection type display device comprising: a partition plate that separates cool air from the cooling fan into cool air toward the main body and the cool air toward the integrated circuit chip. The projection display device according to claim 2,
The projection display device, wherein the flexible substrate is assembled to the partition plate so that the integrated circuit chip and the main body of the light modulation device are separated from each other by the partition plate. In the projection type display apparatus as described in any one of Claims 1-3,
The projection display device, wherein the integrated circuit chip constitutes at least a part of a drive circuit that outputs an image signal to the light modulation device. In the projection type display apparatus as described in any one of Claims 1-4,
A connection terminal for connecting the substrate and the light modulation device is formed at an end of one surface side of the flexible substrate, and the connection terminal and the integrated circuit chip are on the same surface of the flexible substrate. A projection type display device, characterized in that the projection type display device is provided.

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