JP3692781B2 - Projection display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a light source, an optical system that optically processes a light beam emitted from the light source to form an optical image according to image information, and an image formed by the optical system is enlarged and projected onto a projection surface. The present invention relates to a projection display device including a projection lens.
[0002]
[Background]
Conventionally, a light source lamp, an optical system that optically processes a light beam emitted from the light source lamp to form an optical image according to image information, and an image formed by the optical system is enlarged and projected onto a projection surface. 2. Description of the Related Art A projection display device that includes a projection lens that performs such a function is known. Such a projection display device is widely used for multimedia presentations at conferences, academic conferences, exhibitions, and the like.
[0003]
A video, computer, or the like is connected to the projection display device described above, and image information output from a device such as a video, a computer is modulated by a light modulation device that constitutes an optical system. Can form an optical image corresponding to the image information. Specifically, the composite signal and the RGB signal as image information are supplied to the light modulation device via a light modulation device driving unit that drives and controls the light modulation device. The light modulation device driving means converts image signals such as composite signals and RGB signals into a signal form suitable for image display by predetermined signal processing, and supplies the converted signals to a portion for driving the light modulation device. It is. Conventionally, such a light modulation device driving means is integrally formed on a single circuit board as a circuit for driving the light modulation device by an input image signal.
[0004]
[Problems to be solved by the invention]
However, the conventional light modulation device driving means formed on one circuit board described above has the following problems. In other words, the light modulation device driving means processes the portion set according to the specifications of the light modulation device such as the resolution of the light modulation device such as VGA and SVGA, and the composite signal, RGB signal, etc. so as to be suitable for image display. Such as a portion that does not depend on the specifications of the light modulation device. Then, in the conventional light modulation device driving means formed on one circuit board, the circuit substrate including the signal processing portion that does not depend on the specification of the light modulation device is selected according to the specification of the light modulation device of the projection display device. There is a problem that it is not efficient in manufacturing.
[0005]
In addition, if the light modulation device driving means is formed on one circuit board, there is a problem that the circuit board becomes large, which is not preferable for reducing the size of the projection display device.
[0006]
An object of the present invention is to provide a light source, an optical system that optically processes a light beam emitted from the light source to form an optical image according to image information, and an image formed by the optical system is enlarged on a projection surface. An object of the present invention is to provide a projection display device having a projection lens for projection, which can improve the productivity by using common members and contribute to the miniaturization of the device.
[0007]
[Means for Solving the Problems]
    A projection display device according to the present invention includes a light source, an optical system that optically processes a light beam emitted from the light source to form an optical image according to image information, and an image formed by the optical system. A projection display device including a projection lens for enlarging and projecting on a projection surface, the optical display device having a light modulation device driving means for driving and controlling a light modulation device constituting the optical system, The setting is divided into an individual setting unit having different settings according to the specifications of the light modulation device, and a common setting unit that is made common regardless of the specifications of the light modulation device,The common setting unit is provided with a correction circuit that outputs a drive control signal for causing the light modulation device to display an appropriate color based on input image information, and the individual setting unit includes the light A phase expansion circuit for phase expansion of the drive control signal is provided according to the resolution of the modulation device.It is characterized by.
[0009]
In addition, as the above-described light modulation device, various types of devices such as an active matrix driving type liquid crystal element, an electroluminescence element, and a plasma display element can be adopted. Further, the light modulation device drive control means not only controls the drive of one light modulation device, but also a three-plate projection display device that modulates each color of red (R), green (G), and blue (B). In addition, a case where a plurality of light modulation devices are simultaneously driven and controlled is also included.
[0010]
According to the present invention, since the light modulation device driving means is divided into the individual setting unit and the common setting unit, the individual setting is possible even when the specifications of the light modulation device of the projection display device are different. If only the unit is changed, there is no need to change the common setting unit, the member management is rationalized, and the productivity of the projection display device is improved. In addition, since the individual setting unit and the common setting unit are formed separately, the degree of freedom of arrangement of the light modulation device driving means in the projection display device is improved, which can contribute to the miniaturization of the device.
[0011]
In the above, it is preferable that the individual setting unit and the common setting unit described above are formed on two different circuit boards, and these circuit boards are stacked.
[0012]
That is, since the circuit board on which the individual setting unit is formed and the circuit board on which the common setting unit is formed are arranged in a stacked manner, it is easy to electrically connect the two circuit boards, and the productivity is further improved. Further, since they are arranged in a stacked manner, the light modulation device driving means can be efficiently cooled by circulating cooling air through a space sandwiched between two circuit boards.
[0013]
  In addition, the individual setting unit described above is provided with an information carrier circuit that carries setting information of the light modulation device,The correction circuit preferably acquires setting information of the light modulation device from the information holding circuit, corrects the input image information based on the setting information, and outputs the corrected image information.
[0014]
Here, as the information carrier circuit, an information carrier circuit including a switching element that can be switched by Low, High, etc., an information carrier circuit including a nonvolatile memory for recording setting information of the light modulation device, and both are provided. An information carrying circuit can be employed.
[0015]
Further, as the correction circuit, an LUT that outputs a drive control signal for causing the light modulation device to display a predetermined color based on the input image signal, and table information of the LUT are acquired from the information carrier circuit. It is possible to employ a correction circuit including a CPU that performs setting control based on the setting information.
[0016]
That is, since the individual setting unit includes the information carrying circuit, the setting information carried by the information carrying circuit can be acquired by the correction circuit of the common setting unit and the image signal can be corrected. Therefore, even if there is a difference in the characteristics of the light modulation device, it is possible to ensure appropriate color reproducibility of the projection image of the projection display device.
[0017]
In addition, if the information carrier circuit includes a switching element that can be switched, relatively simple information such as the resolution of the light modulation device can be carried. Specifically, when setting information related to resolution is carried by the information carrying circuit, it can be recognized by combining switching elements that can be switched between Low and High as follows.
[0018]
Resolution SW1 SW2
VGA, SVGA Low Low
XGA Low High
SXGA High High
Furthermore, if the information carrier circuit includes a nonvolatile memory, it is possible to carry complicated setting information such as applied voltage-light transmission characteristics of the light modulation device, and in addition, a plurality of light modulation devices. Can be recorded on a single memory. As the non-volatile memory, an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (E2PROM) or the like can be adopted, and information can be written and projected. As long as the recording information is configured not to be lost even if the recording is interrupted, various types of information can be adopted.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0020]
(1) Overall configuration of the device
1 and 2 are schematic perspective views of a projection display device 1 according to the present embodiment. FIG. 1 is a perspective view seen from the upper surface side, and FIG. 2 is a perspective view seen from the lower surface side.
[0021]
The projection display device 1 separates the luminous flux emitted from the light source lamp into the three primary colors of red (R), green (G), and blue (B), and passes these color luminous fluxes through the liquid crystal light valve (modulation system) to obtain image information. The modulated light beams of the respective colors after being modulated are combined by a prism (color combining optical system), and are enlarged and displayed on the projection surface via the projection lens 6. Except for a part of the projection lens 6, each component is housed in the exterior case 2.
[0022]
(2) Exterior case structure
The exterior case 2 is basically composed of an upper case 3 that covers the upper surface of the apparatus, a lower case 4 that forms the bottom surface of the apparatus, and a rear case 5 (FIG. 2) that covers the back surface portion.
[0023]
As shown in FIG. 1, a large number of communication holes 25 </ b> R and 25 </ b> L are formed at the front left and right ends of the upper surface of the upper case 3. An operation switch 60 for adjusting the image quality, focus, etc. of the projection display device 1 is provided between the communication holes 25R, 25L. Further, a light receiving unit 70 for receiving an optical signal from a remote controller (not shown) is provided in the lower left part of the front surface of the upper case 3.
[0024]
As shown in FIG. 2, on the bottom surface of the lower case 4, a lamp replacement cover 27 for replacing a light source lamp unit 8 (described later) housed inside, and an air intake port 240 for cooling the inside of the apparatus. And an air filter cover 23 in which is formed.
[0025]
Further, as shown in FIG. 2, a foot 31C is provided at a substantially central portion of the front end, and feet 31R and 31L are provided at left and right corners of the rear end on the bottom surface of the lower case 4. The foot 31C is rotated by the rear rotating mechanism 312 (FIG. 2) by pulling the lever 311 shown in FIG. 1 upward, and the front side is the device as shown by a two-dot chain line in FIG. It is urged to be opened apart from the main body. The vertical position of the display screen on the projection surface can be changed by adjusting the amount of rotation. On the other hand, the feet 31R and 31L are configured to advance and retract in the protruding direction by rotating, and the inclination of the display lower surface can be changed by adjusting the amount of advancement and retraction.
[0026]
As shown in FIG. 2, the rear case 5 is provided with an AC inlet 50 for supplying external power and various input / output terminal groups 51, and adjacent to these input / output terminal groups 51, air inside the apparatus is circulated. An exhaust port 160 for discharging is formed.
[0027]
(3) Internal structure of the device
3 to 5 show the internal structure of the projection display device 1. 3 and 4 are schematic perspective views of the inside of the apparatus, and FIG. 5 is a vertical sectional view of the projection display apparatus 1. FIG.
[0028]
As shown in these drawings, the exterior case 2 includes a power source unit 7 as a power source, a light source lamp unit 8, an optical unit 10 constituting an optical system, and a light modulation device drive composed of two circuit boards. A driver board 80 and a main board 12 are arranged as means.
[0029]
The power supply unit 7 includes first and second power supply blocks 7A and 7B disposed on both sides of the projection lens 6. The first power supply block 7A transforms the electric power obtained through the AC inlet 50 and supplies it mainly to the second power supply block 7B and the light source lamp unit 8. The transformer (transformer), rectifier circuit, smoothing circuit, voltage It has a ballast circuit. The second power supply block 7B further transforms and supplies the power obtained from the first power supply block 7A, and includes various circuits in addition to the transformer, like the first power supply block 7A. The power is supplied to a power circuit board 13 (shown by a dotted line in FIG. 4) disposed below the optical unit 10 and first and second intake fans 17A, 17B disposed adjacent to the power blocks 7A, 7B. To be supplied. In the power supply circuit on the power supply circuit board 13, power for driving the control circuit on the main board 12 is mainly created based on the power from the second power supply block 7B, and for other low power components. Electricity is being created. Here, the second intake fan 17B is disposed between the second power supply block 7B and the projection lens 6, and is used for cooling through a gap formed between the projection lens 6 and the upper case 3 (FIG. 1). It is provided to suck air from the outside to the inside. Each power supply block 7A, 7B is provided with cover members 250A, 250B having conductivity such as aluminum, and each cover member 250A, 250B outputs sound at a position corresponding to the communication holes 25R, 25L of the upper case 3. Speakers 251R and 251L are provided.
[0030]
The light source lamp unit 8 constitutes a light source portion of the projection display device 1, and includes a light source device 183 including a light source lamp 181 and a reflector 182, and a lamp housing 184 that houses the light source device 183. . Such a light source lamp unit 8 is covered with a housing portion 9021 formed integrally with the lower light guide 902 (FIG. 5), and is configured to be removable from the lamp replacement lid 27 described above. A pair of exhaust fans 16 are juxtaposed on the left and right sides of the housing portion 9021 at positions corresponding to the exhaust ports 160 of the rear case 5, and the first to third intake fans 17 </ b> A to 17 </ b> C are provided by these exhaust fans 16. The cooling air sucked in is introduced into the inside through an opening provided in the vicinity of the housing portion 9021, and after cooling the light source lamp unit 8 with this cooling air, the cooling air is exhausted from the exhaust port 160. is doing. The power of each exhaust fan 16 is supplied from the power supply circuit board 13.
[0031]
The optical unit 10 is a unit that optically processes the light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information, and includes an illumination optical system 923, a color separation optical system 924, and a modulation system 925. And a prism unit 910 as a color synthesis optical system. The optical elements of the optical unit 10 other than the modulation system 925 and the prism unit 910 are sandwiched and held between upper and lower light guides 901 and 902. The upper light guide 901 and the lower light guide 902 are integrated, and are fixed to the lower case 4 side with fixing screws. The light guides 901 and 902 are also fixed to the prism unit 910 side by fixing screws.
[0032]
As shown in FIG. 6, the rectangular parallelepiped prism unit 910 is fixed to the back surface side of the head body 903, which is a substantially L-shaped structure made of a magnesium integrally molded product, by a fixing screw. The liquid crystal light valves 925R, 925G, and 925B constituting the modulation system 925 are disposed to face the three side surfaces of the prism unit 910, and are similarly fixed to the head body 903 with fixing screws. The liquid crystal light valve 925B is provided at a position facing the liquid crystal light valve 925R across the prism unit 910 (FIG. 7), and FIG. 6 shows only the leader line (dotted line) and the reference numeral. The liquid crystal light valves 925R, 925G, and 925B are cooled by the cooling air from the third intake fan 17C that is located on the lower surface of the head body 903 and provided corresponding to the air intake port 240 described above. . At this time, the power of the third intake fan 17C is supplied from the power supply circuit board 13 via the driver board 80. Further, the base end side of the projection lens 6 is similarly fixed to the front surface of the head body 903 by a fixing screw. Thus, the head body 903 on which the prism unit 910, the modulation system 925, and the projection lens 6 are mounted is fixed to the lower case 4 with a fixing screw as shown in FIG.
[0033]
The driver board 80 is used to drive and control each of the liquid crystal light valves 925R, 925G, and 925B of the modulation system 925, and includes an individual setting board 81 and a common setting board 82 described later. The individual setting board 81 and the common setting board 82 are stacked above the optical unit 10, and the individual setting board 81 and the common setting board 82 arranged on the lower side are spaced apart via a stud bolt 9011. Many circuit elements (not shown) that form a control circuit are mounted on the opposing surfaces. Although not shown, the two substrates 81 and 82 are electrically connected by connectors provided at corresponding positions on the surfaces facing each other.
[0034]
The cooling air sucked by the third intake fan 17C described above cools the liquid crystal light valves 925R, 925G, and 925B, and then is supplied to the space between the individual setting board 81 and the common setting board 82. The circuit elements on 81 and 82 are cooled.
[0035]
The main board 12 is formed with a control circuit for controlling the entire projection display device 1, and is erected on the side of the optical unit 10. The main board 12 is electrically connected to the driver board 80 and the operation switch 60, and is also electrically connected to the interface board 14 and the video board 15 provided with the input / output terminal group 51. Further, it is connected to the power supply circuit board 13 via a connector or the like. The control circuit of the main board 12 is driven by power generated by the power supply circuit on the power supply circuit board 13, that is, power from the second power supply block 7B. The main board 12 is cooled by cooling air flowing from the second intake fan 17B through the second power supply block 7B.
[0036]
3, a guard member 19 made of metal such as aluminum is disposed between the main board 12 and the exterior case 2 (only the lower case 4 and the rear case 5 are shown in FIG. 3). The guard member 19 has a large planar portion 191 that extends over the upper and lower ends of the main board 12, the upper side is fixed to the cover member 250 B of the second power supply block 7 A with a fixing screw 192, and the lower end is the lower case 4. For example, when the upper case 3 is attached to the lower case 4, the upper case 3 (FIG. 1) and the main board 12 are prevented from interfering with each other, and the main board 12 is protected from external noise. Yes.
[0037]
(4) Structure of optical system
Next, the structure of the optical system of the projection display apparatus 1, that is, the optical unit 10, will be described with reference to the schematic diagram shown in FIG.
[0038]
As described above, the optical unit 10 converts the illumination optical system 923 that uniformizes the in-plane illuminance distribution of the light beam (W) from the light source lamp unit 8 and the light beam (W) from the illumination optical system 923 into red ( R), green (G), and blue (B), a color separation optical system 924, a modulation system 925 that modulates each color beam R, G, and B according to image information, and each modulated color beam. And a prism unit 910 as a color synthesis optical system.
[0039]
The illumination optical system 923 includes a reflection mirror 931 that bends the optical axis 1a of the light beam W emitted from the light source lamp unit 8 in the front direction of the apparatus, a first lens plate 921 and a second lens plate 921 that are arranged with the reflection mirror 931 interposed therebetween. Lens plate 922.
[0040]
The first lens plate 921 has a plurality of rectangular lenses arranged in a matrix. The first lens plate 921 divides the light beam emitted from the light source into a plurality of partial light beams. Collect light in the vicinity.
[0041]
The second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and the liquid crystal light valves 925R and 925G constituting the modulation system 925 for each partial light beam emitted from the first lens plate 921. , 925B (described later).
[0042]
As described above, in the projection display apparatus 1 of the present example, the illumination optical system 923 can illuminate the liquid crystal light valves 925R, 925G, and 925B with light having substantially uniform illuminance, and thus a projected image without illuminance unevenness. Can be obtained.
[0043]
The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941, a green reflecting dichroic mirror 942, and a reflecting mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B and the green light beam G included in the light beam W emitted from the illumination optical system 923 are reflected at right angles and travel toward the green reflecting dichroic mirror 942.
[0044]
The red light beam R passes through the blue-green reflecting dichroic mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the emitting portion 944 of the red light beam R to the prism unit 910 side. Next, out of the blue and green light beams B and G reflected by the blue-green reflecting dichroic mirror 941, only the green light beam G is reflected at a right angle by the green reflecting dichroic mirror 942, and the prism from the green light beam G emitting portion 945 is reflected. The light is emitted to the unit 910 side. The blue light beam B that has passed through the green reflecting dichroic mirror 942 is emitted from the emitting portion 946 of the blue light beam B to the light guide system 927 side. In this example, the distances from the emission part of the light beam W of the illumination optical system 923 to the emission parts 944, 945, and 946 of the color light beams R, G, and B in the color separation optical system 924 are all set to be equal. .
[0045]
Condensing lenses 951 and 952 are disposed on the emission side of the emission portions 944 and 945 for the red and green light beams R and G of the color separation optical system 924, respectively. Accordingly, the red and green luminous fluxes R and G emitted from the respective emission portions are incident on these condenser lenses 951 and 952 and are collimated.
[0046]
The collimated red and green luminous fluxes R and G are incident on the liquid crystal light valves 925R and 925G through the incident-side polarizing plates 960R and 960G, are modulated, and image information corresponding to each color light is added. . In other words, the liquid crystal light valves 925R and 925G are subjected to switching control according to the image information by the driver board 80, thereby modulating each color light passing therethrough. On the other hand, the blue light beam B is guided to the corresponding liquid crystal light valve 925B through the light guide system 927, where it is similarly modulated according to the image information. As the liquid crystal light valves 925R, 925G, and 925B of the present embodiment, for example, those using polysilicon TFTs as switching elements can be adopted.
[0047]
The light guide system 927 includes a condensing lens 954 arranged on the emission side of the emission part 946 of the blue light beam B, an incident-side reflection mirror 971, an emission-side reflection mirror 972, and an intermediate lens arranged between these reflection mirrors. 973 and a condensing lens 953 disposed on the front side of the liquid crystal light valve 925B. The blue light beam B emitted from the condensing lens 953 enters the liquid crystal light valve 925B through the incident-side polarizing plate 960B. Then modulated. At this time, the optical axis 1a of the light beam W and the optical axes 1r, 1g, and 1b of the color light beams R, G, and B are formed in the same plane. The length of the optical path of each color light beam, that is, the distance from the light source lamp 181 to each liquid crystal panel, is the longest for the blue light beam B, and therefore, the light amount loss of this light beam is the largest. However, the light loss can be suppressed by interposing the light guide system 927.
[0048]
Next, the color light beams R, G, and B modulated through the liquid crystal light valves 925R, 925G, and 925B are incident on the prism unit 910 through the output side polarizing plates 961R, 961G, and 961B, and are combined there. The Then, the color image synthesized by the prism unit 910 is enlarged and projected onto the projection plane 100 at a predetermined position via the projection lens 6.
[0049]
(5) Structure of light modulator drive control means (driver board) 80
As described above, as shown in the block diagram of FIG. 8, the driver board 80 includes the individual setting board 81 having different settings depending on the specifications of the liquid crystal light valves 925R, 925G, and 925B, and the liquid crystal light valves 925R, 925G, and 925B. And a common setting board 82 which is made common regardless of specifications.
[0050]
The common setting board 82 includes a signal processing block 83, a timing circuit block 84, a CPU 85, and an amplifier 86, and the signal processing block 83 and the CPU 85 constitute a correction circuit.
[0051]
The signal processing block 83 is a drive for causing the liquid crystal light valves 925R, 925G, and 925B to display appropriate colors based on the image signal VIDEO input from the input / output terminal group 51 of the interface board 14 via the video board 15. This block outputs control signals SR, SG, and SB, and includes three look-up tables (LUTs) 83R, 83G, and 83B that are set according to the liquid crystal light valves 925R, 925G, and 925B.
[0052]
The timing circuit block 84 is based on the vertical and horizontal synchronizing signals SYNC, and is a driver IC (illustrated) provided in the signal processing block 83, phase expansion circuit blocks 87R, 87G, 87B described later, and liquid crystal light valves 925R, 925G, 925B. (Omitted) is a block for outputting the drive timing signal ST.
[0053]
The CPU 85 controls the signal processing block 83 and the timing circuit block 84. The CPU 85 sets and controls the table information of the aforementioned LUTs 83R, 83G, and 83B, and controls the output of the timing circuit block 84. The CPU 85 is electrically connected to a switching element block 88 and a memory block 89, which will be described later, and is configured to acquire information carried on them. The drive control signals SR, SG, and SB are D / A converted inside the LUTs 83R, 83G, and 83B, amplified by the amplifier 86, and output to the individual setting board 81.
[0054]
The individual setting board 81 includes phase expansion circuit blocks 87R, 87G, 87B, a switching element block 88, and a memory block 89, and the phase expansion circuit block 87 is connected to the liquid crystal light valves 925R, 925G, 925B. ing.
[0055]
The phase expansion circuit blocks 87R, 87G, 87B are portions for phase expansion of the drive control signals SR, SG, SB in accordance with the resolution of the liquid crystal light valves 925R, 925G, 925B. In this way, by expanding the phase of the drive control signals SR, SG, and SB, the liquid crystal light valves 925R, 925G, and 925B that are originally slow in operating speed can be quickly operated in accordance with the change in the image signal VIDEO. The phase expansion circuit blocks 87R, 87G, and 87B in this example can be configured by combining a plurality of ICs (not shown) set to a predetermined number of expansion phases. Specifically, each of the phase development circuit blocks 87R, 87G, and 87B is provided with four connection portions (not shown) for connecting an IC that develops six phases of signals. When the resolution of the liquid crystal light valves 925R, 925G, and 925B is VGA and SVGA, one IC is connected for 6-phase development, for XGA, two ICs are connected for 12-phase development, and for SXGA, IC is used. 4 are connected for 24-phase development.
[0056]
The switching element block 88 includes two resistance switches 881 and 882 that can be switched between Low and High, and determines the resolution that can be supported by the individual setting board 81 based on a combination of switching states of the two resistance switches 881 and 882. be able to. In this example, the following combinations are set.
[0057]
Resolution SW881 SW882
VGA, SVGA Low Low
XGA Low High
SXGA High High
The memory block 89 is composed of a non-volatile E2PROM whose recorded contents are not lost even when the power of the projection display device 1 is shut off, and the setting information of each of the liquid crystal light valves 925R, 925G, and 925B described above is recorded. The recorded setting information includes deviations of the respective liquid crystal light valves 925R, 925G, and 925B at the time of manufacture, or characteristic value information such as γ characteristics, resolution information such as a refresh rate set according to the resolution, and the like. be able to. The setting information of each of the liquid crystal light valves 925R, 925G, and 925B is obtained by measuring the light transmission characteristics of the liquid crystal light valves 925R, 925G, and 925B after manufacturing the projection display device 1, and storing the values in the memory block. 89 may be recorded.
[0058]
(6) Operation of light modulator driving means (driver board) 80
Next, the operation of the driver board 80 having the above configuration will be described.
[0059]
(1) When the projection display device 1 is activated, the CPU 85 of the common setting board 82 acquires setting information such as the resolution and γ characteristics of the liquid crystal light valves 925R, 925G, and 925B from the switching element block 88 and the memory block 89. The table information of the LUTs 83R, 83G, and 83B is set based on the acquired setting information. Further, the CPU 85 outputs the acquired setting information as a status signal STS to image output means such as a personal computer connected to the projection display device 1 via the input / output terminal group 51.
[0060]
(2) An analog image signal input from the input / output terminal group 51 is digitally converted by the video board 15 and the like, and a signal processing block 83 is formed as a digital image signal VIDEO comprising R, G, and B colors of 8 bits. To the LUTs 83R, 83G, and 83B.
[0061]
(3) In each of the LUTs 83R, 83G, 83B, the image signal VIDEO is used as an index for each color of R, G, B, and the table information corresponding to this signal is internally converted into analog signals, and then converted into drive control signals SR, SG, SB. Output.
[0062]
(4) The drive control signals SR, SG, SB are amplified by the amplifier 86 and then supplied to the phase development circuit blocks 87R, 87G, 87B of the individual setting board 81. In the phase expansion circuit blocks 87R, 87G, 87B, the drive control signals SR, SG, SB are phase-expanded based on the number of expansions set according to the resolution of the liquid crystal light valves 925R, 925G, 925B, and the liquid crystal light valves 925R , 925G, 925B driver IC (not shown).
[0063]
(5) On the other hand, the synchronization signal SYNC input together with the image signal VIDEO is supplied to the timing circuit block 84. The timing circuit block 84 is driven by the signal processing block 83, the phase expansion circuit blocks 87R, 87G, 87B, and the driver ICs of the liquid crystal light valves 925R, 925G, 925B based on the synchronization signal SYNC and the control signal SC from the CPU 85. A timing signal ST is output to perform these cooperative operations.
[0064]
(7) Effects of the embodiment
According to this embodiment, there are the following effects.
[0065]
(1) Since the driver board 80 as the light modulation device driving means is divided into the individual setting board 81 and the common setting board 82, the specifications of the liquid crystal light valves 925R, 925G, and 925B of the projection display apparatus 1 are different. Even so, if only the individual setting substrate 81 is changed, there is no need to change the common setting substrate 82, the member management can be rationalized, and the productivity of the projection display device 1 can be improved. Further, since the individual setting board 81 and the common setting board 82 are divided, the degree of freedom of arrangement of the driver board 80 in the projection display apparatus 1 is improved, and the projection display apparatus 1 can be downsized. .
[0066]
(2) Since the individual setting board 81 and the common setting board 82 are stacked, the two circuit boards 81 and 82 can be directly electrically connected by a connector. The productivity of the projection display device 1 can be further improved. In addition, since both the boards 81 and 82 are stacked, the circuit air on the boards 81 and 82 is changed by guiding the cooling air sucked by the third intake fan 17C to the space between the boards 81 and 82. It can be cooled efficiently.
[0067]
(3) Since the individual setting board 81 includes the memory block 89 serving as an information carrier circuit, the deviation, γ characteristics, etc. of the liquid crystal light valves 925R, 925G, and 925B can be recorded in the memory block 89. it can. Then, by using the setting information in the CPU 85, table information corresponding to the characteristics of the liquid crystal light valves 925R, 925G, and 925B is set in the LUT 83R, 83G, and 83B, and the image signal VIDEO is converted by the LUT 83R, 83G, and 83B. The color reproducibility of the projected image can be ensured appropriately by processing.
[0068]
(4) Since the individual setting board 81 includes the switching element block 88 that becomes an information carrying circuit, simple information such as the resolution of the liquid crystal light valves 925R, 925G, and 925B is carried and the specification of the individual setting board 81 is achieved. Can be easily identified.
[0069]
(5) Since the memory block 89 is composed of E2PROM, even if the power of the projection display apparatus 1 is shut off, the recorded information is not lost and the setting information can be used for a long time.
[0070]
(6) Since the phase expansion circuit blocks 87R, 87G, 87B of the individual setting board 81 are configured to be able to change the number of expansion phases, even if the resolution of the liquid crystal light valves 925R, 925G, 925B is different, the expansion IC It is only necessary to increase or decrease the number of connections, and it is possible to further increase the commonality of the members, and to further improve the productivity of the projection display device 1.
[0071]
(7) Since the status signal STS is output from the CPU 85 to image output means such as a personal computer, if an image signal having a resolution not set in the projection display device 1 is set on the personal computer, This status signal can be confirmed on the personal computer.
[0072]
(8) Modification of the embodiment
Note that the present invention is not limited to the above-described embodiment, and includes the following modifications.
[0073]
(1) In the above-described embodiment, the common setting board 82 is laminated and disposed above the individual setting board 81, but the present invention is not limited to this. That is, the common setting board 82 may be arranged vertically as with the main board 12. In short, the arrangement position may be changed as appropriate if it is advantageous in reducing the size of the projection display device.
[0074]
{Circle around (2)} In the above-described embodiment, the memory block 89 is composed of E2PROM. However, the present invention is not limited to this, and the memory block 89 may be an EPROM or a RAM that can maintain power supply by a built-in battery or the like.
[0075]
(3) In the above-described embodiment, the liquid crystal light valves 925R, 925G, and 925B are employed as the light modulators. However, the present invention is not limited to this, and a modulator (ELD) using a light emitting element and a polymer dispersed liquid crystal are used. Even when the present invention is applied to the modulation device (PDP) and the modulation device (DMD) using the micromirror, the same effect as that of the above-described embodiment can be obtained.
[0076]
(4) The projection display device 1 described above includes the three liquid crystal light valves 925R, 925G, and 925B. However, the present invention is not limited to this, and the projection display device 1 includes a single light modulation device. Even if the present invention is used, the same effects as those of the above-described embodiment can be obtained.
[0077]
In addition, the specific structure, shape, and the like when implementing the present invention may be other structures as long as the object of the present invention can be achieved.
[0078]
【The invention's effect】
As described above, according to the present invention, since the light modulation device driving unit is divided into the individual setting unit and the common setting unit, the productivity can be improved by sharing the members. In addition, the degree of freedom of arrangement of the light modulation device driving means can reduce the size of the device.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a projection display device according to an embodiment of the present invention as viewed from above.
FIG. 2 is an external perspective view of the projection display device according to the embodiment viewed from below.
FIG. 3 is a perspective view showing an internal structure of the projection display device in the embodiment.
FIG. 4 is a perspective view showing an optical system inside the projection display apparatus in the embodiment.
FIG. 5 is a vertical sectional view showing the internal structure of the projection display device in the embodiment.
6 is a vertical sectional view showing a structure on which a modulation system, a color synthesis optical system, and a projection lens are mounted in the embodiment. FIG.
FIG. 7 is a schematic diagram for explaining a structure of an optical system of the projection display device in the embodiment.
FIG. 8 is a block diagram showing a structure of a light modulation device driving unit in the embodiment.
[Explanation of symbols]
1 Projection display
6 Projection lens
10 Optical system
80 Light modulator driving means
81 Individual setting section
82 Common setting section
88, 89 information carrier circuit (switching element, memory)
181 Light source lamp
925R, 925G, 925B light modulator

Claims (5)

A light source, an optical system that optically processes a light beam emitted from the light source to form an optical image according to image information, and a projection lens that magnifies and projects an image formed by the optical system on a projection surface A projection display device comprising:
A light modulation device driving means for driving and controlling a light modulation device constituting the optical system;
This light modulation device driving means is divided into an individual setting unit having different settings according to the specifications of the light modulation device, and a common setting unit that is made common regardless of the specifications of the light modulation device,
The common setting unit is provided with a correction circuit that outputs a drive control signal for causing the light modulation device to display an appropriate color based on input image information.
The projection display device, wherein the individual setting unit is provided with a phase expansion circuit for phase-expanding the drive control signal in accordance with the resolution of the light modulation device. The projection display device according to claim 1,
The projection display apparatus, wherein the individual setting unit and the common setting unit are formed on two different circuit boards, and the circuit boards are stacked. The projection display device according to claim 1 or 2,
The individual setting unit is provided with an information carrying circuit for carrying setting information of the light modulation device,
The projection display device , wherein the correction circuit acquires setting information of the light modulation device from the information holding circuit, corrects the input image information based on the setting information, and outputs the corrected image information . The projection display device according to claim 3,
The projection display apparatus, wherein the information carrying circuit includes a switching element that can be switched. In the projection display device according to claim 3 or 4,
The projection display device, wherein the information carrier circuit includes a nonvolatile memory that records setting information of the light modulation device.

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