JP2006071929A - Image display device - Google Patents

Abstract

An image display apparatus capable of protecting image display setting information at the time of sudden power interruption.
An image display device includes an image display unit 441, a control unit 6, and a power supply unit 51. The control means 6 is connected to the main control system 61 that controls the entire apparatus, a display control system 62 that is connected to the main control system 61 and controls the image display unit 441 using signals from the main control system 61, and a display control system 62. And a memory 63 in which image display setting information is written. The power supply means 51 monitors the power supply state of the external power supply and supplies a power cutoff detection unit 5111, 5122, 5123 that outputs a power cutoff signal to the display control system 62 when the power supply is cut off, and supplies holding power when the power is cut off. A power holding unit 5113A. The display control system 62 includes a communication cut-off unit that cuts off communication with the main control system 61 when a power cut-off signal is input. Accordingly, the image display setting information can be protected when the power supply is cut off.
[Selection] Figure 6

Description

  The present invention relates to an image display device including an image display unit that displays an image according to video information input from outside.

  Conventionally, projectors are used for presentations at conferences, academic conferences, exhibitions, and the like. Such a projector includes a light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, and a projection that enlarges and projects the optical image formed by the light modulation device. The lens includes a lens and a control unit that controls driving of the entire projector.

  By the way, recent projectors have image quality information such as hue, color density, contrast, sharpness, brightness, etc., that is, a light modulation device, etc. The image display setting information can be changed by the user. However, even if such image display setting information is changed, if the changed image display setting information is restored when the power switch is turned off and then turned on again, it is necessary to set it again. And is troublesome for the user.

  With respect to such a problem, there is a known projector in which a control unit stores the image display setting information (image quality information) in a storage device when a power switch of the projector is turned off (for example, Patent Documents). 1). In the projector disclosed in Patent Document 1, when the power switch is turned off by the user, the control unit detects that the power switch is turned off, and stores the image display setting information in the memory configured by the EEPROM. Shut off the power supply to the light source. Thereafter, when the power switch is turned on again, the control unit reads setting information stored in the memory, and drives the projector based on the setting information to project an image. Accordingly, the image display setting information can be read / saved according to the user's power switch on / off, and the troublesomeness of the user to reset the display image quality can be eliminated.

JP 2000-81666 A

  However, in the projector described in Patent Document 1, when the connection with the external commercial power supply is disconnected or the power supply is suddenly cut off at the time of a power failure, it is different from the case where the power switch is turned off by the user. There is a problem that the image display setting information cannot be saved and the power-off process cannot be normally performed. Further, when the power supply is cut off, the stored setting information may be updated or deleted with incorrect data due to fluctuations in the power supply potential or the like. For this reason, when the power switch is turned on again after the power supply is restored, the setting information is not correctly stored, so that the display image is disturbed.

  An object of the present invention is to provide an image display device capable of protecting image display setting information at the time of sudden power interruption.

  In order to achieve the above object, an image display device of the present invention is an image display device including an image display unit that displays an image according to video information input from the outside, and drives the image display device. A control unit for controlling, and a power supply unit for supplying power to at least the control unit and the image display unit. The control unit controls the entire image display device, and the main control system. And a display control system that performs drive control of the image display unit based on a signal from the main control system, and image display setting information of the image display unit based on a signal of the display control system The power supply means monitors the power supply state of the external power supply, and outputs a power cut-off signal to the display control system when the power supply is cut off, and from the external power supply A power holding unit that holds a part of the supplied power and supplies at least the power held when the power is cut to the display control system, and the display control system receives the power cut-off signal A communication cut-off unit that cuts off communication with the main control system using electric power supplied from the power holding unit is provided.

According to the present invention, when the power supply from the external power supply is cut off, the display control system stores the image display setting information stored in the memory by cutting off the communication between the main control system and the display control system. Can be prevented from being updated and deleted by the image display setting information and control signals output from the main control system.
In other words, communication between the main control system and the display control system is interrupted even if the main control system outputs erroneous image display setting information or control signals to the display control system due to fluctuations in the power supply potential when the power is shut off. Therefore, the setting information output from the main control system is not input to the display control system. This can prevent the display control system from updating or deleting the image display setting information stored in the memory with incorrect information.
Therefore, it is possible to prevent the image display setting information stored in the memory from being updated with incorrect information, and to protect the image display setting information.

The power shutoff signal is output to the display control system that stores the setting information in the memory. The display control system that receives the power shutoff signal shuts off communication with the main control system and Do not accept the signal. According to this, the power cutoff signal is output to the main control system where control information and processing of the entire image display apparatus are concentrated, and communication is cut off compared to the case where communication with the display control system is cut off by the main control system. Processing can be performed quickly. Therefore, the process at the time of power-off can be performed quickly, and the maintainability of the image display setting information can be further enhanced.
Further, the power temporarily held by the power holding unit of the power supply means is used to cut off the communication between the display control system and the main control system. According to this, the driving power of the display control system can be ensured even when the power is shut off. Therefore, the communication connection between the main control system and the display control system can be reliably interrupted.

In the present invention, when the power cut-off signal is input, the display control system is configured to cut off the communication with the main control system by the communication cut-off unit and use the power supplied from the power holding unit to It is preferable that an information writing unit for writing the image display setting information before the power-off signal is input to the memory is provided.
According to the present invention, the display control system stores, in the memory, the latest image display setting information read before the power-off signal is input when the power is shut down. According to this, the latest image display setting information can be reliably protected and stored.
In addition, when the display control system stores the image display setting information after disconnecting communication with the main control system, the image display setting information is stored based on incorrect information from the main control system. Can be prevented. Therefore, the maintainability of the image display setting information can be further improved.

Further, in the present invention, the main control system generates and outputs an error signal when a communication monitoring unit that periodically monitors a communication state with the display control system and communication interruption is detected by the communication monitoring unit. An error signal output unit is preferably provided.
In such a case, the image display device described above is electrically connected to the main control system and the power supply unit, and outputs a warning that a failure has occurred based on an error signal from the error signal output unit. It is preferable that a warning output unit is provided.

According to the present invention, the communication monitoring unit of the main control system regularly monitors the communication state with the display control system, so that the main control system is disconnected from the display control system, that is, It can be detected that the interruption of the power supply from the external power source has occurred. In addition, the main control system includes an error signal output unit that generates and outputs an error signal when power supply interruption is detected, so that the image display device is configured by outputting the error signal. Error processing based on the error signal can be executed by the component.
Furthermore, since the warning output unit to which such an error signal is input outputs a warning that a failure has occurred in the image display device based on the error signal, the user can be surely notified of the occurrence of the failure. it can. Such a warning output unit can be constituted by an indicator, a speaker, or the like. In other words, when the warning output unit is configured with an indicator, it blinks or lights up when an error signal is input, and when configured with a speaker, a warning sound is emitted to notify the user of the occurrence of a failure. be able to.

In the present invention, the main control system, the power supply means, and a light source that illuminates the image display unit are electrically connected to the light source based on an error signal from the error signal output unit. It is preferable to include a power regulation unit that regulates the power supply.
According to the present invention, when an error signal from the error signal output unit of the main control system is input to the power regulation unit, the power regulation unit regulates power supply to the light source, and thus the image display unit is illuminated. This can prevent the display of a disturbed image. Therefore, it is possible to prevent an abnormal image from being displayed due to a variation in the power supply potential when the power is shut off.
Even when the power supply is restored, the power supply to the light source is restricted, and the image display unit is not illuminated by the light source, so that no image is displayed on the image display unit, and the user can connect to the image display device. It is possible to notify that a failure has occurred.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(1) External Configuration FIG. 1 is a perspective view of a projector 1 according to the present embodiment as viewed from the upper front side. FIG. 2 is a perspective view of the projector 1 as viewed from the lower front side. FIG. 3 is a perspective view of the projector 1 as viewed from the upper back side.
The projector 1 as an image display device modulates a light beam emitted from a light source in accordance with image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIGS. 1 to 3, the projector 1 includes a substantially rectangular parallelepiped outer case 2 and a projection lens 3 exposed from the outer case 2.
Among these, the projection lens 3 has a function as a projection optical system for enlarging and projecting an optical image modulated and formed by a liquid crystal panel 441 (see FIG. 5) as a light modulation device to be described later. The lens holding cylinder 3A is configured as a combined lens in which a plurality of lenses are housed.

The outer case 2 is a synthetic resin casing having a substantially rectangular shape in plan view, and houses an apparatus main body including an optical unit 4 described later of the projector 1. The outer case 2 includes an upper case 21 covering the upper surface portion of the apparatus main body, a lower case 22 covering the lower surface portion of the apparatus main body, a front case 23 covering the front surface portion of the apparatus main body, and a part of a side surface portion of the apparatus main body. And a rear case 25 (see FIG. 3) covering the back portion of the apparatus main body.
Note that the corners of the top surface, front surface, side surface, bottom surface, and back surface of the exterior case 2 are formed in a curved surface.

The upper case 21 includes an upper surface portion 21A having a substantially rectangular shape that covers the upper surface portion of the apparatus main body, a side surface portion 21B that substantially hangs down from one end portion in the long side direction of the upper surface portion 21A, and a long side of the upper surface portion 21A. A side surface portion 21C that substantially hangs down from the front portion of the other end portion in the direction and a back surface portion 21D (see FIG. 3) that hangs down substantially from the rear end portion of the upper surface portion 21A.
As shown in FIGS. 1 and 3, an operation panel 26 that performs startup / adjustment operation of the projector 1 is provided at a substantially central portion on the back side of the upper surface portion 21 </ b> A so as to extend in the horizontal direction. The operation panel 26 includes a plurality of operation switches 261 including a power switch 262 and an indicator 263 (not shown in FIG. 3) that is turned on when a failure occurs in driving the projector 1. When the power switch 262 is appropriately pressed, a tact switch mounted on a circuit board (not shown) arranged inside the operation panel 26 is brought into contact with, and a desired operation can be performed. In addition, an LED (not shown) is attached to the circuit board so as to emit light according to a desired operation.
Furthermore, the operation panel 26 includes a decorative plate 264 disposed so as to surround the operation switch 261, the power switch 262, and the indicator 263, and light from the LED is diffused through the decorative plate 264.

Further, from the front side (the right side in FIG. 1) of the upper surface portion 21A, two dials constituting a projection lens position adjusting mechanism (not shown) for adjusting the position of the projection lens 3 by moving the projection lens 3 up and down and left and right. 311 and 321 are exposed.
When the dial 311 arranged on the left side in FIG. 1 is moved in the Y1 direction (downward), the projection lens 3 moves in the Y3 direction (downward) and the dial 311 moves in the Y2 direction (upward). When the lens is moved to, the projection lens 3 moves in the Y4 direction (upward).
When the dial 321 arranged on the right side in FIG. 1 is moved in the X1 direction (rightward when viewed from the rear of the projector 1), the projection lens moves in the X3 direction (rightward), and the dial 321 is moved in the X2 direction (from the rear of the projector 1). When it is moved in the left direction as viewed, the projection lens 3 moves in the X4 direction (left direction).
Further, although not shown, a rib is provided on the inner surface side of the upper surface portion 21 </ b> A so as to surround the outer periphery of the projection lens 3.

The side surface portion 21 </ b> C is formed with a notch 21 </ b> C <b> 1 in which the louver 71 composed of a plurality of blades 711 is exposed.
Further, as shown in FIG. 3, the back surface portion 21D is formed with a notch 21D1 with which the rear case 25 is engaged.

The lower case 22 includes a bottom surface portion 22A, side surface portions 22B and 22C, a back surface portion 22D, and a front surface portion 22E, as shown in FIGS.
The bottom surface portion 22A has a substantially rectangular plane shape, and a fixed leg portion 22A1 is provided at the center of the bottom surface portion 22A on the back side of the projector 1 and adjustment leg portions 27 are provided at both ends in the long side direction on the front surface side. It has been.
The adjustment leg 27 includes a shaft-like member 271 (see FIG. 4) that protrudes forward and backward from the bottom surface 22 </ b> A so as to be able to move forward and backward. The inclination position of the direction can be adjusted.
In addition, an opening 22A3 that communicates with the inside of the exterior case 2 is formed in the bottom surface portion 22A. The opening 22A3 is an intake port for taking cooling air outside the outer case 2 into the outer case 2, and a cover 22A5 having a plurality of openings is attached to the opening 22A3.

The side surface portion 22B is erected from one end portion of the bottom surface portion 22A in the long side direction, and engages with the side surface portion 21B of the upper case 21 as shown in FIG. Configure the side.
The side surface 22B is formed with a recess 22B1 that is recessed toward the upper case 21. The recess 22B1 is used as a grip when the projector 1 is gripped.
As shown in FIG. 1, the side surface portion 22C is erected from the front side portion of the other end portion in the long side direction of the bottom surface portion 22A, and engages with the side surface portion 21C of the upper case 21, A part of the side surface of the outer case 2 is formed. The upper end of the side surface portion 22C is greatly cut, and the louver 71 is exposed from the notch 22C1. That is, an opening through which the louver 71 is exposed is formed by the notch 21C1 of the side surface portion 21C and the notch 22C1 of the side surface portion 22C. Air that has cooled the inside of the projector 1 is discharged from the opening.

As shown in FIG. 3, the back surface portion 22D is erected from one end portion in the short side direction of the bottom surface portion 22A, and the back surface portion 22D has a notch 22D1 with which the rear case 25 is engaged. Is formed. In other words, in the present embodiment, the rear portions 21D and 22D and the rear case 25 constitute the rear surface of the outer case 2.
A rectangular opening 22D2 is formed in the back surface portion 22D, and the inlet connector 22D3 is exposed from the opening 22D2. The inlet connector 22D3 is a terminal that supplies power to the projector 1 from an external power supply, and is electrically connected to the power supply unit 5 described later.
Again, as shown in FIG. 1, the front surface portion 22E is erected from the other end portion in the short side direction of the bottom surface portion 22A. The front surface portion 22E engages with the front case 23, and these constitute the front surface of the exterior case 2.

As shown in FIGS. 1 and 2, the front case 23 has a substantially elliptical shape, and an opening 231 for exposing the projection lens 3 is formed on the end portion in the longitudinal direction (right side in FIG. 1).
In addition, a remote control light receiving window 232 is formed at a substantially central portion of the front case 23. Inside this remote control light receiving window 232, a remote control light receiving unit 2321 (not shown in FIGS. 1 to 3) for receiving an operation signal from a remote controller (not shown) is arranged.
The remote controller is provided with the same operation switch 261 including the power switch 262 provided on the operation panel 26 described above. When the remote controller is operated, an infrared signal corresponding to this operation is transmitted from the remote controller. This output infrared signal is received by the remote control light receiving unit 2321 through the remote control light receiving window 232 and processed by the control board 6 described later.

As shown in FIGS. 1 and 3, the side case 24 includes an upper surface portion 24A and a side surface portion 24C that is substantially suspended from the upper surface portion 24A. The upper surface portion 24 </ b> A is engaged with the upper surface portion 21 </ b> A of the upper case 21 to constitute the upper surface of the exterior case 2.
The side surface portion 24 </ b> C engages with the side surface portion 21 </ b> C of the upper case 21 and the side surface portion 22 </ b> C of the lower case 22.

As shown in FIG. 3, the rear case 25 is fitted and fixed in an opening formed by a notch 21D1 of the back surface portion 21D of the upper case 21 and a notch 22D1 of the back surface portion 22D of the lower case 22.
The rear case 25 has a substantially rectangular plane shape, and a remote control light receiving window 232 similar to that of the front case 23 is formed in the vicinity of the end in the longitudinal direction.
The rear case 25 is formed with a recess 251 that is recessed toward the inside of the exterior case 2, and a plurality of connection terminals 252 are exposed from the recess 251.
The connection terminal 252 is used to input image signals, audio signals, and the like from an external electronic device. The connection terminal 252 is connected to an interface board (not shown) located inside the rear case 25. Yes.
The interface board is electrically connected to a control board 6 described later, and a signal processed by the interface board is output to the control board 6.

(2) Internal Configuration FIG. 4 is a diagram showing an internal configuration of the projector 1. Specifically, only the lower case 22 of the outer case 2 is left, and the upper case 21, the front case 23, the side case 24, and the rear case 25 are removed.
Inside the exterior case 2 is housed an apparatus main body of the projector 1, and the apparatus main body includes an optical unit 4 extending in the left-right direction along the longitudinal direction of the exterior case 2, a power supply unit 5, and an optical unit 4. And a control board 6 as a control means disposed above.

(3) Structure of Optical Unit 4 FIG. 5 is a schematic diagram showing the configuration of the optical unit 4.
The optical unit 4 modulates the light beam emitted from the light source device according to image information to form an optical image, and forms a projection image on a projection surface such as a screen via the projection lens 3. As shown in FIG. 5, the optical unit 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44 in which a light modulation device and a color synthesis optical device are integrated, These optical components 41, 42, 43, and 44 are functionally broadly divided into optical component casings (not shown) that house and arrange them.

  The integrator illumination optical system 41 is an optical system for making the luminous flux emitted from the light source uniform in the illumination optical axis orthogonal plane. The integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

The light source device 411 includes a light source lamp 411A as a radiation light source, a reflector 411B, and an explosion-proof glass 411C that covers a light beam emission surface of the reflector 411B. Then, the radial light beam emitted from the light source lamp 411A is reflected by the reflector 411B to become a substantially parallel light beam, and is emitted to the outside.
In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 411A. However, the present invention is not limited to this, and for example, a metal halide lamp or a halogen lamp may be used. Moreover, although the parabolic mirror is employ | adopted as the reflector 411B, you may employ | adopt the structure which has arrange | positioned the collimating concave lens not only to this but to the output surface of the reflector which consists of an ellipsoidal mirror.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 411A into partial light beams and emits them in the direction of the illumination optical axis.
The second lens array 413 has substantially the same configuration as the first lens array 412, and includes a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on liquid crystal panels 441R, 441G, and 441B described later of the optical device 44 together with the superimposing lens 415.

The polarization conversion element 414 converts the light from the second lens array 413 into approximately one type of polarized light, thereby improving the light use efficiency in the optical device 44.
Specifically, each partial light beam converted into approximately one kind of polarized light by the polarization conversion element 414 is finally substantially superimposed on liquid crystal panels 441R, 441G, 441B, which will be described later, of the optical device 44 by the superimposing lens 415. . In a projector using liquid crystal panels 441R, 441G, and 441B of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source lamp 411A that emits randomly polarized light is not used. For this reason, the use efficiency of light in the optical device 44 is enhanced by converting the light beam emitted from the light source lamp 411A into substantially one type of polarized light using the polarization conversion element 414. Such a polarization conversion element 414 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. A plurality of partial light beams emitted from the integrator illumination optical system 41 are separated into three color lights of red (R), green (G), and blue (B) by two dichroic mirrors 421 and 422.
The relay optical system 43 includes an incident side lens 431, a pair of relay lenses 433, and reflection mirrors 432 and 435. The relay optical system 43 has a function of guiding blue light, which is color light separated by the color separation optical system 42, to a liquid crystal panel 441B described later of the optical device 44.

  At this time, in the dichroic mirror 421 of the color separation optical system 42, among the light beams emitted from the integrator illumination optical system 41, the green light component and the blue light component are transmitted, and the red light component is reflected. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 419, and reaches the red liquid crystal panel 441R. The field lens 419 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 419 provided on the light incident side of the other liquid crystal panels 441G and 441B.

Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 419, and reaches the liquid crystal panel 441G for green light. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 419, and reaches the blue light liquid crystal panel 441B.
Note that the relay optical system 43 is used for blue light because the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 419 as it is. The relay optical system 43 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

  The optical device 44 modulates an incident light beam according to image information to form a color image. The optical device 44 includes three incident-side polarizing plates 442 on which the respective color lights separated by the color separation optical system 42 are incident, and a liquid crystal panel 441 as a light modulation device disposed at the subsequent stage of the incident-side polarizing plate 442. (441R, 441G, 441B), an exit-side polarizing plate 444, and a cross dichroic prism 445 as a color synthesizing optical device.

  The liquid crystal panels 441R, 441G, and 441B are configured as an image display unit according to the present embodiment. For example, a polysilicon TFT is used as a switching element. Is hermetically sealed. The liquid crystal panels 441R, 441G, and 441B modulate and emit the light beam incident through the incident side polarizing plate 442 according to image information.

The incident side polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. A polarizing film is attached to a substrate such as sapphire glass. It has been done.
The exit side polarizing plate 444 is also configured in substantially the same manner as the incident side polarizing plate 442, and transmits only polarized light in a predetermined direction among the light beams emitted from the liquid crystal panels 441R, 441G, and 441B, and transmits the other light beams. The polarization axis of the polarized light that is absorbed and transmitted is set to be orthogonal to the polarization axis of the polarized light that is transmitted by the incident-side polarizing plate 442.

The cross dichroic prism 445 forms a color image by synthesizing optical images emitted from the emission-side polarizing plate 444 and modulated for each color light. In the cross dichroic prism 445, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are provided in a substantially X shape along the interfaces of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film.
The liquid crystal panels 441R, 441G, 441B, the exit-side polarizing plate 444, and the cross dichroic prism 445 described above are integrally configured as a unit.

(4) Configuration of Power Supply Unit 5 FIG. 6 is a block diagram showing configurations of the power supply unit 5 and the control board 6.
The power supply unit 5 supplies power to the light source device 411, the control board 6 described later, the liquid crystal panel 441, and the like, and is disposed along the longitudinal direction of the front case 23 of the exterior case 2.
4 and 6, the power supply unit 5 includes a power supply block 51 as power supply means, a lamp drive block 52 (not shown in FIG. 4) disposed below the power supply block 51, a lamp A power regulating unit 53 (not shown in FIG. 4) that regulates the power supplied to the drive block 52 is provided.
Among these, the power supply block 51 is covered with a cylindrical member 5A as a shield member, and the cylindrical member 5A is made of aluminum and is formed in a substantially box shape with both ends opened.

(4-1) Configuration of Power Supply Block 51 The power supply block 51 supplies power supplied from the outside through a power cable connected to the inlet connector 22D3 to the lamp drive block 52, the control board 6, and the like.
As shown in FIG. 6, the power supply block 51 is divided into a primary power supply system 511 and a secondary power supply system 512.

Among these, the primary side power supply system 511 includes a power supply monitoring unit 5111, a rectifier circuit 5112, a smoothing circuit 5113, and a booster circuit 5114 in the order in which the power supplied from the external power source flows. .
The power supply monitoring unit 5111 constitutes a power cutoff detection unit according to the present invention. The power supply monitoring unit 5111 monitors the supply state of power supplied from an external power source. When the power supply state is cut off, the secondary side described later A signal indicating that the power supply has been cut off is output to the signal input unit 5122 constituting the power supply system 512. Such a power supply monitoring unit 5111 can be configured by a light emitting element such as a photodiode. That is, the power supply monitoring unit 5111 outputs a signal to the signal input unit 5122 (described later) as a signal that light is emitted in the power supply state and not lighted in the power supply cutoff state.

The rectifier circuit 5112 generates a pulsating current from an alternating current of power supplied via the power supply monitoring unit 5111. Such a rectifier circuit 5112 can be configured by a diode bridge or the like configured by combining four diodes.
The smoothing circuit 5113 smoothes the pulsating current generated by the rectifying circuit 5112 into a direct current. Such a smoothing circuit 5113 includes a capacitor, and a stable direct current is supplied by the capacitor. In addition, this capacitor is a capacitor having a large power holding amount so that power can be supplied to the control board 6 and the like when the power supply from the external power source is cut off. The power holding unit 5113A of the invention is used. According to this, it is not necessary to separately provide an electronic component corresponding to the power holding unit 5113A in the power supply unit 5 which is a power supply unit. Therefore, it can be constituted by a general-purpose power supply unit, and the configuration of the power supply unit 5 can be simplified.
The booster circuit 5114 is composed of a transformer or the like, and boosts the voltage of the DC-converted current. A part of the electric power boosted through the booster circuit 5112 is supplied to the lamp driving block 52 via the power regulating unit 53, and the other part is supplied to the transformer circuit 5121 of the secondary power supply system 512.

The secondary power supply system 512 supplies the power supplied from the primary power supply system 511 to each electronic component constituting the projector 1. The secondary power supply system 512 includes a transformer circuit 5121, a signal input unit 5122, and a cutoff signal output unit 5123.
Among these, the transformer circuit 5121 transforms and supplies the voltage of the power supplied from the booster circuit 5114 of the primary-side power supply system 511 according to the electronic components constituting the projector 1.

The signal input unit 5122 and the cutoff signal output unit 5123 together with the power supply monitoring unit 5111 of the primary side power supply system 511 constitute a power cutoff detection unit of the present invention.
Among these, the signal input unit 5122 receives a signal indicating that power supply has been cut off from the power supply monitoring unit 5111. When this signal is input to the signal input unit 5122, the signal input unit 5122 outputs a predetermined signal to the cutoff signal output unit 5123.

  In the case where the power supply monitoring unit 5111 described above is configured by a light emitting element, the signal input unit 5122 can be configured by a light receiving element such as a phototransistor that receives light from the light emitting element. With the power supply monitoring unit 5111 configured with such a light emitting element, a change in the power supply state can be represented by a change in the light emission intensity of the light emitting element, and with the signal input unit 5122 configured with the light receiving element, A change in the power supply state can be detected by detecting the light emission intensity. Therefore, by configuring the power supply monitoring unit 5111 and the signal input unit 5122 with light emitting elements and light receiving elements, the power supply state can be detected quickly and with a simple configuration.

When the signal input from the signal input unit 5122 continues for a predetermined period, the cutoff signal output unit 5123 generates a power cutoff signal, and sends it to the power cutoff signal receiver 625 of the display control system 62 constituting the control board 6 described later. The power cutoff signal is output. In the present embodiment, the interruption signal output unit 5123 has a signal input duration from the signal input unit 5122 of 25 msec or more so that the interruption of one cycle or more of the alternating current supplied from the external commercial power supply can be detected. In addition, a power cutoff signal is generated and output. Thereby, the interruption signal output unit 5123 can prevent the instantaneous power failure from being regarded as a continuous power failure, and the projector 1 can be driven stably.
In the present embodiment, it is assumed that the power supply is cut off when the signal input duration is 25 msec or longer. However, the signal input duration for which the power supply is considered to be cut off may be 25 msec or longer, as appropriate. May be set.

  Of these power supply monitoring unit 5111, signal input unit 5122 and cutoff signal output unit 5123, the power supply monitoring unit 5111 can detect the power supply state prior to current conversion in the primary power supply system 511. Further, the signal input unit 5122 and the cutoff signal output unit 5123 generate and output the power cutoff signal using the power supplied from the power holding unit 5113A when the power supply is cut off based on the signal from the power supply monitoring unit 5111. can do. Accordingly, it is possible to output a power shut-off signal to the display control system 62 of the control board 6 described later quickly and reliably.

(4-2) Configuration of Lamp Drive Block 52 The lamp drive block 52 rectifies and transforms a direct current input from the power supply block 51 via the power regulating unit 53 to generate an alternating current rectangular wave current. The rectangular wave current is supplied to the light source lamp 411A of the light source device 411.
As shown in FIG. 6, the lamp driving block 52 includes a down converter 521, an inverter bridge 522, and an igniter 523 in the order in which the current supplied from the power supply block 51 flows.

  The down converter 521 removes high frequency noise and steps down the supplied direct current. Specifically, the DC voltage input at about 300 to 400 V is stepped down to about 50 to 150 V suitable for lighting the light source lamp 411A. Although not shown in detail, the down converter 521 includes a coil element and a diode that are connected in series, and a transistor and a capacitor that are branched and connected from these circuit elements.

  The inverter bridge 522 converts a direct current into an alternating current rectangular wave current. Although not shown in the figure, the inverter bridge 522 is configured as a bridge circuit including a pair of two transistors and a total of four transistors. The bridge circuit receives a direct current that has been stepped down through the down converter 521 and applies a pulse signal to each of the transistors. A path including one pair of transistors and a path including the other pair of transistors are provided. The current flows by short-circuiting alternately. Thereby, an alternating current rectangular wave current can be generated.

The igniter 523 is configured as a circuit that performs a dielectric breakdown between the electrodes of the light source lamp 411A and prompts the start of the light source lamp 411A.
Although not shown, the igniter 523 includes a high voltage pulse generation circuit and a pulse transformer connected to the primary side of the high voltage pulse generation circuit. The high voltage pulse generated by the high voltage pulse generation circuit is supplied to the pulse transformer. By boosting the voltage on the secondary side and applying the boosted power to the light source lamp 411A, the insulation between the electrodes of the light source lamp 411A is broken, electrical conduction is ensured, and the light source lamp 411A starts lighting.

  The down converter 521 and the inverter bridge 522 that constitute such a lamp driving block 52 are electrically connected to a main control system 61 of the control board 6 described later. The main control system 61 outputs a voltage signal for determining the voltage level to the down converter 521, and outputs a pulse signal to the transistor of the inverter bridge 522. As a result, the voltage applied to the light source lamp 411A changes, and the light emission luminance of the light source lamp 411A is controlled.

(4-3) Configuration of Power Regulator 53 The power regulator 53 corresponds to the power regulator of the present invention, and includes a booster circuit 5114 that constitutes the primary power supply system 511 of the power supply block 51, and the lamp drive block 52. And is electrically connected to a main control system 61 of the control board 6 which will be described later, and is supplied from the booster circuit 5114 to the lamp driving block 52 by a power regulation signal as an error signal from the main control system 61. Regulate power.
Specifically, the power regulating unit 53 supplies the power supplied from the booster circuit 5114 to the lamp driving block 52. On the other hand, when a power regulation signal is input from the main control system 61, the power regulation unit 53 cuts off the power supply from the booster circuit 5114 to the lamp drive block 52.

  As shown in FIG. 4, an exhaust fan 72 is installed on the side of the power supply unit 5 described above, and air that has cooled the power supply unit 5 is discharged from an opening to which the louver 71 is attached. Further, a duct 73 is installed between the power supply unit 5 and the optical component casing (not shown), and the air that has cooled the light source device 411 is drawn by the exhaust fan 72, and the duct 73 is And is discharged from the opening.

(5) Structure of Control Board 6 The control board 6 is disposed above the optical unit 4 as shown in FIG. The control board 6 is configured as a circuit board on which an arithmetic processing device such as a CPU (Central Processing Unit) is mounted, and is a control means for controlling the entire projector 1.

As shown in FIG. 6, the control board 6 drives and controls the main control system 61 that controls the driving of the entire projector 1 and the liquid crystal panels 441 (441R, 441G, 441B) according to video information input from the outside. A display control system 62, a memory 63 that reads / writes image display setting information such as the liquid crystal panel 441 by the display control system 62, and a bus 64 that communicatively connects the main control system 61 and the display control system 62. It has.
Of these, the memory 63 is configured by a flash memory in the present embodiment, but may be any recording medium that can be electrically written and erased, and may be configured by an EEPROM or the like.

Here, the bus 64 blocks data transfer from the main control system 61 to the display control system 62 by at least the display control system 62 out of the main control system 61 and the display control system 62 connected via the bus 64. It is configured to be able to.
As such a bus 64, for example, an I2C bus (Inter IC Bus) can be adopted. The I2C bus can be connected via two lines, SCL (serial clock) and SDA (serial data), and transfers data while maintaining SDA transfer synchronization at two high and low voltage levels of SCL. Do. Here, the display control system 62 can shut off the signal output from the main control system 61 as a standby state by setting the SCL for the main control system 61 to a low level.

  Based on the operation signals output from the operation switches 261, the power switch 262, and the remote control light receiving unit 2321 of the operation panel 26, the main control system 61 downs the display control system 62 and the lamp drive block 52. A control signal is appropriately output to the converter 521, the inverter bridge 522, and the like.

The main control system 61 includes a communication monitoring unit 611 and an error signal output unit 612.
The communication monitoring unit 611 monitors the communication state of the bus 64 connected to the display control system 62, and performs a determination process at a rate of once per second. For example, the communication monitoring unit 611 determines the voltage level of the SCL that connects the main control system 61 and the display control system 62 when the bus 64 is an I2C bus. Further, the communication status may be monitored by transmitting predetermined data from the communication monitoring unit 611 to the display control system 62 and determining whether or not there is a response to the data from the display control system 62. Although the determination by the communication monitoring unit 611 is once per second, the determination is not limited to this and may be set as appropriate.

The error signal output unit 612 generates and outputs an error signal to the warning output unit connected to the main control system 61 when the communication monitoring unit 611 detects the disconnection of the communication connection with the display control system 62. . As such a warning output unit, the above-described indicator 263 and speaker 28 are provided. When a lighting signal and a warning sound generation signal are input as error signals from the error signal output unit 612 to the indicator 263 and the speaker 28, the indicator 263 is turned on and the warning sound is output from the speaker 28. The user can be notified that a failure has occurred in driving.
In addition, the error signal output unit 612 generates and outputs a power regulation signal as an error signal to the power regulation unit 53 of the power supply unit 5, and the power regulation unit 53 to which the power regulation signal is input is supplied from the power supply block 51 to the lamp drive block. The power supply to 52 is cut off.

FIG. 7 is a block diagram showing the configuration of the display control system 62.
The display control system 62 uses the liquid crystal panels 441R, 441G, and the like based on the video information input from the external connection device connected to the projector 1 through the interface board and the image display setting information recorded in the memory 63. 441B is driven and controlled.
As shown in FIG. 7, the display control system 62 includes an image conversion unit 621, an image control unit 622, a scanning driver 623, a signal driver 624, a power cutoff signal receiving unit 625, a clock generation unit 626, An information reading / writing unit 627 and a communication blocking unit 628 are provided.

The image conversion unit 621 extracts a horizontal synchronization signal, a vertical synchronization signal, and a composite synchronization signal from video information input from the interface board, for example, a composite video signal. In addition, the image conversion unit 621 generates a horizontal synchronization signal, a vertical synchronization signal (also referred to as a synchronization signal) and a video signal according to the specifications of the image control unit 622 based on the extracted signals, and generates an image. The data is output to the control unit 622.
Note that the clock generator 626 generates a pulse signal having a predetermined frequency based on the synchronization signal.

The image control unit 622 is based on the image display setting information input from the main control system 61 according to the operation of the operation switch 261 by the user, or based on the image display setting information read from the memory 63. Then, the synchronization signal and the video signal input from the image conversion unit 621 are adjusted and output to the scanning driver 623 and the signal driver 624.
Further, the image control unit 622 receives the control signal for storing the image display setting information input from the main control system 61 in the memory 63 and the control signal for reading the image display setting information stored in the memory 63. The data is output to the reading / writing unit 627.

The scanning driver 623 and the signal driver 624 are respectively connected to the scanning line 441V and the signal line 441H of the liquid crystal panel 441, and based on the synchronization signal and the video signal output from the image control unit 622, the driving signal of the liquid crystal panel 441 It outputs to the scanning line 441V and the signal line 441H.
Among these, the scan driver 623 includes a shift register 6231. The shift register 6231 includes a plurality of registers that hold vertical synchronizing signals input from the image control unit 622. By shifting these registers in synchronization with the pulse signal generated by the clock generator 626, the drive signal of the liquid crystal panel 441 is sequentially output to the scanning line 441V.
The signal driver 624 includes a shift register 6241 and a sample / hold circuit 6242. Among these, the shift register 6241 is configured to include a plurality of registers that hold a horizontal synchronization signal input from the image control unit 622, similarly to the shift register 6231. Each of these registers is shifted in synchronization with the pulse signal generated by the clock generator 626 so that the sample / hold circuit 6242 holds the video signal, and the held video signal is sequentially output to the signal line 441H.

The power cutoff signal receiving unit 625 receives the power cutoff signal output from the cutoff signal output unit 5123 of the power supply unit 5 and outputs a signal indicating that the power cutoff signal has been received to the image control unit 622.
The information reading / writing unit 627 reads image display setting information stored in the memory 63 based on a control signal from the image control unit 622 and outputs the information from the main control system 61 via the bus 64. The image display setting information of the liquid crystal panel 441 and the like is written into the memory 63 and stored.
The communication blocking unit 628 blocks communication of the bus 64 that connects the main control system 61 and the display control system 62. As described above, when the bus 64 is formed of an I2C bus, the SCL for the main control system 61 is set to a low level to block data transfer from the main control system 61. Moreover, it is good also as a structure which interrupts | blocks a communication line using a switching element.

(6) Power-off processing Here, processing of the projector 1 when the power switch 262 or the power switch (not shown) of the remote controller is turned off will be described.
When the power switch 262 or the power switch of the remote controller is turned off in a state where the power supply from the external power supply is normally performed, as shown in FIG. 6, the circuit board connected to the power switch 262 and the remote control light reception From unit 2321, a power off signal is output to main control system 61. The main control system 61 to which the power-off signal is input outputs a control signal for instructing the display control system 62 to store the image display setting information. The display control system 62 to which the control signal has been input is used to display the image display setting information read from the memory 63 by the information reading / writing unit 627 or the image display output changed from the main control system 61 by the user. The setting information is written in the memory 63 and the driving of the liquid crystal panel 441 is stopped.

  After that, the main control system 61 outputs a light extinction signal of the light source lamp 411A to the lamp driving block 52 and also outputs a power regulation signal to the power regulation unit 53, and supplies power from the power supply block 51 to the lamp driving block 52. And the light source lamp 411A is turned off. As a result, power supply to the components of the projector 1 is restricted.

  By such a power-off process, when the power switch is turned off, after the image display setting information is stored in the memory 63, the power-off process such as turning off the light source lamp 411A is performed. It is possible to reliably hold the information and reduce the complexity of resetting by the user.

(7) Processing when power supply is cut off Next, processing when power supply is cut off performed by the projector 1 when the power supply to the projector 1 is suddenly cut off, such as when the connection with the external power supply is disconnected or during a power failure Will be described.
Hereinafter, since the projector 1 is not driven when the power switch 262 is turned off, the power-off process when the power switch 262 is turned on and the projector 1 is normally driven will be described. .

FIG. 8 is a diagram illustrating a processing flow of power supply interruption processing.
As shown in FIG. 8, in the power supply state, the projector 1 converts the alternating current supplied from the external commercial power source into a direct current by the power supply block 51 of the power supply unit 5, and converts the converted direct current to the secondary power. The voltage is transformed to a predetermined voltage by the supply system 512 and supplied to the components of the projector 1 including the control board 6 including the display control system 62 and the main control system 61 (processing S11).
When the power supply by this process S11 is started, the display control system 62 monitors whether the power shut-off signal is input by the power shut-off signal receiving unit 625 (process S21), and the main control system 61 performs communication. The monitoring unit 611 monitors the communication state of the bus 64 connected to the display control system 62 (processing S31).
Here, part of the power supplied from the external commercial power source is held in the power holding unit 5113A.

The power supply state by the process S11 is monitored by the power supply monitoring unit 5111 and the signal input unit 5122 constituting the power interruption detection unit (process S12), and the determination process of the power supply state is performed (process S13).
Here, when the power supply interruption is not detected, that is, when the power supply is normally performed, the power supply by the process S11 is continued.
On the other hand, when the power supply interruption is detected, that is, when the power supply monitoring unit 51 detects the power supply interruption, the power supply is interrupted from the power supply monitoring unit 5111 to the signal input unit 5122. A predetermined signal indicating that is output (step S14). Further, the power held in the power holding unit 5113A is automatically released due to the decrease in the applied voltage level to the power holding unit 5113A due to the power supply cutoff (processing S15). The power of the power holding unit 5113A released by this processing S15 is supplied to the booster circuit 5114 of the primary power supply system 511, and then supplied to the light source device 411 through the power regulating unit 53 and the lamp driving block 52. Then, the secondary power supply system 512 is supplied to the control board 6 and the like configured to include the main control system 61 and the display control system 62. Thereby, even when the power supply from the external commercial power supply is interrupted, the processes S16 to S18 by the power supply block 51, the processes S22 to S24 by the display control system 62, and the processes S32 and S33 by the main control system 61 are executed. be able to.

A signal from the power supply monitoring unit 5111 is input to the cutoff signal output unit 5123 via the signal input unit 5122, and the cutoff signal output unit 5123 determines an input duration period of this signal (processing S16). In this process S16, when it is determined that the signal input period is less than 25 msec, the cutoff signal output unit 5123 regards that the interruption of the power supply is an instantaneous power failure, returns to the process S11, and monitors the power supply state again. Let it continue.
On the other hand, when it is determined that the signal input period is 25 msec or more, the cutoff signal output unit 5123 regards that the power supply has been continuously cut off, generates a power cutoff signal, and receives the power cutoff signal of the display control system 62. The power cutoff signal is output to the unit 625 (processing S17).
By determining the signal input continuation period in such processing S16, it is considered that the power supply has been cut off for a short-term power failure such as a momentary power failure that occurs at the time of switching between a device that supplies external commercial current or a transmission line. The projector 1 can be driven stably without any problems.

Further, the monitoring of the power supply state by the power supply monitoring unit 5111 is also performed after the power cut-off signal is output by the cut-off signal output unit 5123 in the process S17. If it is determined that the power supply has been restored by determining whether the power supply has been restored (step S18), a signal indicating that the power supply has been cut off is not input to the signal input unit 5122. The output of the power cutoff signal from the signal output unit 5123 is stopped (process S19), the process returns to process S11, the power supply is restarted, and the projector 1 is normally operated. On the other hand, when the power supply is not restored, the processing in the power supply block 51 is terminated.
Note that in the case where the power supply monitoring unit 5111 is configured to include a light emitting element and the signal input unit 5122 is configured to include a light receiving element that receives light emitted from the light emitting element, light emission is performed along with restoration of power supply. Since the element emits light and this light emission can be automatically detected by the light receiving element, the determination process in the process S17 can be performed easily and automatically.

  The display control system 62 determines whether or not a power-off signal has been input in a state where the input of the power-off signal is being monitored by the power-off signal receiver 625 in step S21 (step S22). Here, when the power-off signal receiving unit 625 has not received the power-off signal, the process returns to step S21 to continue monitoring the input of the power-off signal. On the other hand, when the power shutoff signal is output by the processing S17 of the power block 51 and the power shutoff signal receiving unit 625 receives the power shutoff signal, the image control unit 622 uses the communication shutoff unit 628 to display the display control system. The processing routinely performed at 62 is interrupted, and the communication connection to the main control system 61 performed via the bus 64 is interrupted (processing S23). For example, when the bus 64 is configured by an I2C bus, the communication cutoff unit 628 sets the SCL voltage level for the main control system 61 to a low level.

By disconnecting the communication between the main control system 61 and the display control system 62 when the power supply is cut off in the processing S23, the display control system 62 can transfer the image of the liquid crystal panel 441 or the like to which data is transferred from the main control system 61 It is possible to prevent the image display setting information recorded in the memory 63 from being updated with the display setting information.
That is, the main control system 61 connected to the operation switches 261 and 262 of the operation panel 26 and the remote control light receiving unit 2321 changes the driving state of the liquid crystal panel 441 by the operation of the user operation switch 261 and the remote controller. The image display setting information is output to the display control system 62. In the display control system 62, the image display setting information recorded in the memory 63 is transferred from the main control system 61 by the information reading / writing unit 627. Update the image display setting information. However, when the power supply is cut off, incorrect image display setting information is transferred from the main control system 61 due to a change in power supply potential or the like, and the transfer data is changed to instruct deletion of the image display setting information. May be output.
Even in such a case, since the communication connection between the main control system 61 and the display control system 62 is interrupted, the display control system 62 is caused by erroneous image display setting information and control signals output from the main control system 61. It is possible to prevent the image display setting information stored in the memory 63 from being updated or deleted. Therefore, the image display setting information can be protected.

Further, the power cut-off signal is output to the display control system 62, and the communication control with the main control system 61 is cut off by the display control system 62 that has received the power cut-off signal. Compared with the case where communication is cut off by the main control system 61, the cut-off process (S23) can be executed quickly. Further, since the communication interruption after receiving the power interruption signal is executed by interrupting the normal processing of the display control system 62, the response to the power interruption can be improved. Therefore, maintainability of the image display setting information can be improved.
Further, the communication connection between the display control system 62 and the main control system 61 when the power is shut off uses the power held by the power holding unit 5113A. Therefore, the communication connection is reliably shut down even when the power is shut off. The image display setting information can be reliably protected.

After the communication connection between the display control system 62 and the main control system 61 in the process S23 as described above is cut off, the information display setting information for the image display such as the liquid crystal panel 441 used before receiving the power cut-off signal is read. The data is stored in the memory 63 by the writing unit 627 (processing S24), and the processing in the display control system 62 ends.
According to such processing S24, the image display setting information used until immediately before receiving the power-off signal is recorded in the memory 63, so that the latest image display setting information can be stored. In addition, since the image display setting information is stored after the communication connection between the display control system 62 and the main control system 61 is cut off, an erroneous image display from the main control system 61 to the display control system 62 is performed. Therefore, the latest image display setting information can be reliably stored, and the maintainability of the image display setting information can be further enhanced.

In the main control system 61, the communication monitoring unit 611 in the process S31 is monitoring the communication state of the bus 64, and the communication monitoring unit 611 causes the main control system 61 via the bus 64 to transfer to the display control system 62. It is determined whether data transfer is possible (step S32). For this determination, for example, predetermined data may be transferred to the display control system 62, and the determination may be made based on the presence or absence of a response from the display control system 62 to the data. Also, when the bus 64 is configured by an I2C bus. Then, it can be performed by detecting the voltage level of SCL.
Here, when the communication connection of the bus 64 between the main control system 61 and the display control system 62 is not interrupted, the process returns to the processing S31 and the communication monitoring unit 611 continues to monitor the communication state of the bus 64.
On the other hand, when the communication connection of the bus 64 is interrupted, the error signal output unit 612 outputs an error signal to the components of the projector 1 (processing S33). Examples of such components include a power regulation unit 53 provided in the power supply unit 5, an indicator 263, a speaker 28, and the like as a warning output unit.

The power regulation unit 53 that has output the power regulation signal as an error signal cuts off the power supply from the power supply block 51 to the lamp drive block 52. As a result, the power supply from the power holding unit 5113 to the light source device 411 is cut off, so that the power supply from the external power supply is cut off and the image formed on the liquid crystal panel 441 is disturbed due to fluctuations in the power supply potential or the like. Even if it exists, it can prevent displaying an abnormal image and can prevent giving a user discomfort. In addition, by cutting off the power supply to the light source device 411, the finite power held by the power holding unit 5113 can be suppressed from being consumed by the light source device 411, and the power supply performed by the control board 6 or the like. The process at the time of interruption | blocking can be performed reliably.
In addition, the indicator 263 and the speaker 28 to which the lighting signal and the warning sound generation signal are output as error signals execute the lighting and warning sound generation to notify the user that a failure has occurred in driving the projector 1. Thereby, it is possible to reliably notify the user that a drive failure has occurred in the projector 1.

  According to the above power supply interruption process, that is, the processes S22 to S24 of the display control system 62 starting from the process S17 of the power supply block 51 and the processes S32 to S33 of the main control system 61, the power supply interruption is detected. The cut-off signal output unit 5123 of the power supply block 51 outputs a power cut-off signal to the power cut-off signal receiving unit 625 of the display control system 62, which triggers the communication cut-off unit 628 of the display control system 62 to perform display control. By disconnecting the communication connection between the system 62 and the main control system 61, the image display setting information in the memory 63 is protected. Further, the communication monitoring state of the display control system 62 and the main control system 61 is monitored by the communication monitoring unit 611 of the main control system 61. When the communication connection cut-off is detected, the error signal output unit 612 Since the error signal is output to the regulating unit 53 and the indicator 263 and the speaker 28 as the warning output unit, the light source device 411 is turned off, the indicator 263 is turned on, and the warning sound of the speaker 28 is generated. It is possible to reliably notify that one drive failure has occurred.

(8) Power-on processing Next, power-on processing that is performed when the power switch 262 is turned on by the user will be described.
FIG. 9 is a diagram showing a processing flow of power-on processing.
In the power-on process, as shown in FIG. 9, power is supplied from the power supply block 51 of the power supply unit 5, and the power switch 262 of the operation panel 26 or the power button of the remote controller is turned on by the user. In this case, first, the communication monitoring unit 611 of the main control system 61 detects whether the communication connection with the display control system 62 performed via the bus 64 is interrupted (process R1).

  If the communication connection with the display control system 62 is not interrupted, that is, if communication with the display control system 62 and data transfer to the display control system 62 are possible, the projector 1 is normally driven. (Processing R2). For example, a control signal is output from the main control system 61 to the display control system 62, and the display control system 62 acquires the image display setting information stored from the memory 63. Further, a control signal for instructing lighting of the light source lamp 411A is output to the lamp driving block 52.

  On the other hand, when the communication connection with the display control system 62 is interrupted, the components of the projector 1, for example, the power regulating unit 53, the indicator 263, and the speaker 28 of the power supply unit 5 are connected to the projector 1 in the same manner as the processing S33 described above. Then, a power regulation signal, a lighting signal, and a warning sound generation signal are output as error signals (processing R3). As a result, the light source lamp 411A is not turned on, so that the optical image is not projected, and the indicator 263 is turned on to indicate that the drive of the projector 1 has failed. Since a warning sound is generated from 28, it is possible to reliably notify the user that a drive failure of the projector 1 has occurred. In such a case, an image may be displayed based on general-purpose image display setting data until the display setting is changed after a reset operation such as a reset switch input by the user.

(9) Modification of Embodiments The best configuration for carrying out the present invention has been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

In the above embodiment, the projector 1 is taken as an example of the image display device. However, the present invention is not limited to this, and the present invention is applied to a liquid crystal display and a display-integrated personal computer such as a notebook computer. Also good. Further, although the liquid crystal panel 441 is used as the image display unit, an image display unit other than the liquid crystal such as a device using a micromirror may be used.
Furthermore, although the example of the front type projector 1 that performs projection from the direction of observing the screen has been described, the present invention can also be applied to a rear type projector that performs projection from the side opposite to the direction of observing the screen. .

  In the above embodiment, when the power supply monitoring unit 5111 that constitutes the power cutoff detection unit detects the cutoff of the power supply, the power supply of the display control system 62 is controlled by the cutoff signal output unit 5123 that also constitutes the power cutoff detection unit. Although the power cutoff signal is output to the cutoff signal receiving unit 625, the present invention is not limited to this. For example, at the time of power supply, a predetermined signal is always output from the cutoff signal output unit 5123, the cutoff of power supply is detected by the power supply monitoring unit 5111, and the cutoff signal output unit 5123 determines that the power supply cutoff is continued. In such a case, the power supply cutoff may be transmitted to the display control system 62 so that the signal is not output.

In the embodiment, the indicator 263 and the speaker 28 are provided in the projector 1 as the warning output unit. However, the present invention is not limited thereto, and a liquid crystal display unit different from the liquid crystal panel 441 is provided, and the failure content is displayed on the liquid crystal display unit. Such a configuration may be used.
Further, when the power supply is turned on again after the power supply interruption occurs, the power regulation unit 53 to which the power regulation signal is input by the process R3 turns off the light source lamp 411A of the light source device 411. The present invention is not limited to this, and an image representing the failure content is formed by the liquid crystal panel 441, the light source lamp 411A is turned on, the image is projected on the projection surface, and the failure content of the projector 1 is notified to the user. May be.

In the above-described embodiment, the configuration in which the optical unit 4 has a substantially L shape in plan view has been described. However, the configuration is not limited thereto, and for example, a configuration having a substantially U shape in plan view may be employed.
In the above-described embodiment, the transmissive liquid crystal panel 441 having a different light beam incident surface and light beam emission surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emission surface may be used.

  The present invention can be used not only for projectors but also for image display devices such as liquid crystal displays.

The perspective view which looked at the projector which concerns on one Embodiment of this invention from the upper front side. The perspective view which looked at the projector in the said embodiment from the downward front side. The perspective view which looked at the projector in the said embodiment from the upper back side. The perspective view which shows the internal structure of the projector in the said embodiment. The schematic diagram which shows the optical unit in the said embodiment. The block diagram which shows the structure of the power supply unit and control board in the said embodiment. The block diagram which shows the structure of the display control system in the said embodiment. The figure which shows the processing flow of the process at the time of the electric power supply interruption | blocking in the said embodiment. The figure which shows the processing flow of the process at the time of power activation in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector (image display apparatus), 6 ... Control board (control means), 28 ... Speaker (warning output part), 51 ... Power supply block (power supply means), 53 ... Power control part, 61 ... Main control system, 62 Display control system 63 Memory 263 Indicator (warning output unit) 411 Light source device (light source) 441 (441R, 441G, 441B) Liquid crystal panel (image display unit) 611 Communication monitoring unit 612 ... Error signal output unit, 627 ... Information reading / writing unit (information writing unit), 628 ... Communication cutoff unit, 5111 ... Power supply monitoring unit (power cutoff detection unit), 5113A ... Power holding unit, 5122 ... Signal input (Power cutoff detection unit), 5123... Cutoff signal output unit (power cutoff detection unit).

Claims (5)

An image display device including an image display unit that displays an image according to video information input from the outside,
Control means for controlling the drive of the image display device, and at least power supply means for supplying power to the control means and the image display unit,
The control means includes
A main control system for controlling the entire image display device;
A display control system that is connected to the main control system and performs drive control of the image display unit based on a signal from the main control system;
A memory in which setting information for image display of the image display unit is written based on a signal of the display control system;
The power supply means
A power-off detection unit that monitors the power supply state of the external power supply and outputs a power-off signal to the display control system when the power supply is cut off;
A power holding unit that holds a part of the power supplied from the external power supply and supplies at least the display control system with the power held when the power is cut off;
The display control system includes a communication cut-off unit that cuts off communication with the main control system by power supplied from the power holding unit when the power cut-off signal is input. Display device. The image display device according to claim 1,
When the power cut-off signal is input to the display control system, the communication cut-off unit communicates with the main control system, and the power supplied from the power holding unit causes an image before the power cut-off signal is input. An image display device comprising: an information writing unit for writing display setting information into the memory. The image display device according to claim 1 or 2,
The main control system
A communication monitoring unit for periodically monitoring the communication state with the display control system;
An image display device comprising: an error signal output unit that generates and outputs an error signal when communication interruption is detected by the communication monitoring unit. The image display device according to claim 3.
A warning output unit that is electrically connected to the main control system and the power supply unit and outputs a warning that a failure has occurred based on an error signal from the error signal output unit, An image display device. In the image display device according to claim 3 or 4,
Electrically connected to the main control system, the power supply means, and a light source that illuminates the image display unit, and regulates power supply to the light source based on an error signal from the error signal output unit An image display device comprising a power regulating unit.

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