JP2011023866A - Projection video display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection video display which does not reduce life of a lamp and optical components in the surroundings even when a main microcomputer hangs up during lighting of the lamp. <P>SOLUTION: The projection video display 1 includes the lamp 6 for projecting video images, and a cooling fan 13 which cools the lamp 6, has the main microcomputer 16a which controls the projection video display 1 in a normal operation, and a standby microcomputer 16b which controls the projection video display 1 instead of the main microcomputer in standby, wherein the standby microcomputer 16b reboots the main microcomputer 16a when the main microcomputer 16a hangs up, transmits a lighting state of the lamp 6 immediately before reboot and information that the reboot is the reboot after a communication error with the main microcomputer 16a to the main microcomputer 16a immediately after the reboot, and the main microcomputer 16a controls the cooling fan 13 based on the information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection type video display device such as a projector, and more particularly to a projection type video display device equipped with a microcomputer for controlling a discharge lamp and a cooling fan.

  A projection type video display device (hereinafter also simply referred to as “projector”) such as a DLP (Digital Light Processing) (registered trademark) projector irradiates light from a light source to an optical display element such as a DMD (Digital Micromirror Device), The irradiated light is modulated with a video signal, and the image is enlarged and projected on a screen. In order to realize a high-brightness projector, it is necessary to use a high-brightness discharge lamp (hereinafter simply referred to as “lamp”) such as a mercury lamp as a light source. Naturally, a high-intensity lamp has a large temperature rise, and unless it is properly cooled, the life of the lamp itself and the surrounding optical components is reduced.

  Therefore, it is necessary to cool the lamp and peripheral optical components by a cooling fan while the lamp is on. Further, if the cooling fan is stopped at the same time as the lamp is turned off, the high temperature state continues for a while, leading to a reduction in the life of the lamp and peripheral optical components. Therefore, even if the user turns off the power from the remote control or the operation panel and turns off the lamp, the cooling fan continues to rotate for a predetermined time, and the rotation of the cooling fan is stopped after the temperature of the lamp decreases. The main microcomputer of the projector takes charge of the on / off control of the lamp and the cooling fan.

  By the way, while the main microcomputer is operating normally, the on / off control of this lamp and cooling fan is performed properly, but there is a problem if the main microcomputer hangs up due to heat or noise while the lamp is on. Occur. That is, if the main microcomputer hangs up and is rebooted (restarted) while the lamp is on, there is no information on the lamp lighting state immediately before the hang-up, so the lamp is turned off and the cooling fan is also stopped. The lamp is lit until immediately before the reboot, and although the cooling fan is stopped although it should originally be cooled for a while, there is a problem that the lamp temperature rises and the lamp life decreases.

  As a technique for controlling the lamp and the cooling fan by rebooting at the time of hang-up of the microcomputer, there is a conventional one disclosed in Patent Document 1. Japanese Patent Application Laid-Open No. 2004-133867 does not stop the lamp and the cooling fan even when the main microcomputer is rebooted with a reset switch or the like, and therefore the projector can be used immediately after the main microcomputer is rebooted. The operation mode before the hang-up is stored in an external EEPROM so that the operation mode before the hang-up can be restored upon reboot.

  Further, as disclosed in Patent Document 2, the projector has a standby mode in which the lamp is turned off to stand by for power saving. In the standby mode, the projector accepts an operation from the user and communicates with an external device. Since it only needs to operate, it is often equipped with a standby microcomputer that is small and consumes less power than the main microcomputer.

JP 2001-305659 A JP 2006-308934 A

  By the way, in the above-mentioned Patent Document 1, there is a description about how quickly the projector can be returned to a usable state when the microcomputer hangs up, but there is no description about the life of the lamp. In addition, when the microcomputer hangs up, the lamp is turned on and the cooling fan is also rotated, and the state is maintained even at reset. However, if the microcomputer hangs up due to heat or noise, there is no guarantee that the operating state of the lamp or cooling fan will be maintained. In consideration of lamp life and safety, it may be better to turn off the lamp when the microcomputer hangs up.

  The present invention has been made in view of the above, and provides a projection-type image display device that does not reduce the life of the lamp and peripheral optical components even when the main microcomputer hangs up while the lamp is lit. The purpose is to do.

  In order to achieve the above object, a projection display apparatus according to the present invention is a projection display apparatus including a lamp for projecting an image and a cooling fan for cooling the lamp, during normal operation. It has a main microcomputer that controls the projection type video display device and a standby microcomputer that controls the projection type video display device instead of the main microcomputer during standby. When the main microcomputer hangs up, the standby microcomputer Reboot, immediately after rebooting, send information to the main microcomputer indicating that the lamp was lit just before the reboot and that the reboot was a reboot after a communication error with the main microcomputer, and the main microcomputer controls the cooling fan based on the information It is characterized by that.

  With this configuration, even if the main microcomputer hangs up due to heat or noise while the projection display is operating (the lamp is lit), the lamp immediately before the hang-up is turned on from the standby microcomputer when the main microcomputer reboots. Information indicating that a communication error with the status and main microcomputer has occurred can be acquired. Therefore, the cooling fan can be appropriately controlled based on the lighting state of the lamp immediately before the main microcomputer is hung up. As a result, it is possible to reduce a decrease in lamp life.

  In the projection display apparatus of the present invention, if the lamp is lit just before the main microcomputer is rebooted, the main microcomputer may stop the cooling fan after rotating it for a predetermined time immediately after the reboot of the main microcomputer. .

  With such a configuration, even when the main microcomputer hangs up and reboots during the operation of the projection display apparatus (while the lamp is lit), the lamp is cooled for a predetermined time, thus reducing the decrease in lamp life. be able to.

  In the projection type image display device of the present invention, if the lamp is lit immediately before the main microcomputer is rebooted, the main microcomputer turns on the lamp after rotating the cooling fan for a predetermined time immediately after the reboot of the main microcomputer. May be.

  With such a configuration, it is possible to reduce lamp life reduction, and even when the main microcomputer hangs up while projecting an image, it is possible to immediately resume image projection.

  According to the present invention, even when the main microcomputer hangs up while the lamp is lit, it is possible to provide a projection display apparatus that does not reduce the life of the lamp and peripheral optical components.

It is a figure which shows an example of installation of the projection type video display apparatus in embodiment of this invention. It is a block diagram which shows the internal structure of the projection type video display apparatus. It is a flowchart which shows operation | movement of the standby microcomputer of the projection type video display apparatus. It is a flowchart which shows operation | movement of the main microcomputer of the projection type video display apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
First, the configuration of the projection display apparatus 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a diagram showing an example of installation of a projection-type image display device 1 (hereinafter also simply referred to as “this device 1”) in the present embodiment. FIG. 2 is a block diagram showing the internal configuration of the apparatus 1.

  The apparatus 1 is installed on a ceiling 1 a of a building, for example, and projects an image on a screen 30 installed on a wall surface 31.

  The apparatus 1 is supplied with power by operating a power switch 40 provided on the wall surface 31. Video output from a personal computer (not shown) or a DVD player (not shown) is input to the apparatus 1 via an input terminal 50 provided on the wall surface 31. The user operates the remote controller 23 to perform operations such as starting and stopping the apparatus 1 and switching between various modes. Further, a video signal from a personal computer or a DVD player may be directly input to the apparatus 1 by wireless or the like without using the input terminal 50.

  As shown in FIG. 2, the apparatus 1 includes an image processing unit 3 that performs image processing for driving a DMD element 5 on a video signal (for example, a DVD playback video) input to the video input terminal 2. A DMD driving unit 4 for driving the DMD element 5 with an output image signal of the image processing unit 3, a lamp 6 for emitting high-intensity white light, and white light from the lamp 6 in three primary colors (red, green, blue ) In a time-sharing manner, a rod integrator 8 for equalizing the luminance distribution, a mirror 9, a projection lens 10, a motor 11 for rotating the color wheel 7, and the rotation of the color wheel 7. A motor driving unit 12 for synchronizing with a video signal, a lamp driving unit 14 for applying a voltage necessary for the lamp 6, a cooling fan 13 for cooling the lamp 6, and driving the cooling fan 13 A fan driving unit 15, a main microcomputer 16a that controls the apparatus 1 during normal operation, a standby microcomputer 16b that controls the apparatus 1 during standby, RAMs 17a and 17b, flash memories (nonvolatile memories) 18a and 18b, An operation panel 19, a remote control receiver 20 that receives signals from the remote controller 23, a communication unit 21 that communicates with an external device such as an external personal computer 60, and a display unit 22 that displays the status of the apparatus 1 with LEDs or the like. And a power source unit 24 connected to a commercial power source and supplying power to each unit.

  The high-intensity white light generated by the lighting of the lamp 6 is transmitted through the color wheel 7 and dispersed into the three primary colors in a time-sharing manner, the luminance distribution is made uniform by the rod integrator 8, and the mirror 9 is projected at an appropriate projection angle. The DMD element 5 is irradiated after being irradiated and refracted. Reflected light modulated by the video signal in the DMD element 5 is enlarged by the projection lens 10 and projected as a video on a screen (not shown).

  In the present apparatus 1, a standby mode (standby mode) can be set in addition to the normal operation mode (video projection mode). In this standby mode, the power supply to the lamp 6 and the main circuit that consumes the most power is stopped, and when the power is turned on by the operation panel 19 or the remote controller 23, the standby mode in which the image can be projected immediately. It is.

  A commercial power supply is connected to the power supply unit 24 and supplies necessary power to each unit of the apparatus 1 according to various modes. For example, in normal operation, power is supplied to almost all blocks including the lamp 6, but in standby, power is supplied only to the operation panel 19, the remote control receiver 20, the communication unit 21, the display unit 22, and the microcomputer and its peripheral circuits. Supply.

  The main microcomputer 16a controls the lighting of the lamp 6 by driving the lamp driving unit 14 during normal operation, and controls the on / off of the cooling fan 13 and the rotational speed according to the temperature detected by a temperature sensor (not shown). Perform almost any control over normal operation. The operation program and data of the main microcomputer 16a are stored in the flash memory 18a. When the main microcomputer 16a is activated, it is read from the flash memory 18a and developed on the RAM 17a. Thereafter, the processing of the main microcomputer is executed according to the program code developed on the RAM 17a.

  The standby microcomputer 16b receives the operation commands from the operation panel 19, the remote control receiving unit 20, and the communication unit 21 during standby and performs necessary control. Further, it communicates with the lamp driving unit 14 to acquire and hold the lighting state of the lamp 6. This is to cause the main microcomputer 16a to appropriately control the cooling fan 13 when the main microcomputer 16a is hung up for some reason and rebooted. This will be explained later. Further, the state of the apparatus 1 is displayed on the display unit 22. The operation program and data of the standby microcomputer 16b are stored in the flash memory 18b, read out from the flash memory 18b when the standby microcomputer 16b is activated (for example, when the main power is turned on), and developed on the RAM 17b. Thereafter, processing of the standby microcomputer is executed in accordance with the program code developed on the RAM 17b.

  The main microcomputer 16a and the standby microcomputer 16b always communicate with each other. When the standby microcomputer 16b receives an operation command from the operation panel 19, the remote control receiving unit 20, and the communication unit 21, the operation command is interpreted and necessary information is stored in the main microcomputer 16b. This is transmitted to the microcomputer 16a.

  On the operation panel 19, the user directly operates the operation key to give an instruction to the apparatus 1. An operation from the user is accepted and the operation content is transmitted to the main microcomputer 16a or the standby microcomputer 16b.

  The remote control receiving unit 20 receives an operation instruction from the remote controller 23 and transmits the instruction content to the main microcomputer 16a or the standby microcomputer 16b. As a remote control method, there are an optical method using infrared rays, a wireless LAN method using radio waves, and the like.

  Operations from the operation panel 19 and the remote controller 23 include power on / off, various menu settings, input source switching, and the like. In general, the user operates the operation panel 19 or the remote controller 23 to display a menu on the screen 30 for operation. The operation information is transmitted to the main microcomputer 16a and the standby microcomputer 16b. Each microcomputer receives this instruction and controls related blocks.

  The communication unit 21 is a serial interface such as RS232c that communicates with the outside, or a network interface such as Ethernet (registered trademark).

  The display unit 22 includes a display element such as an LED, and notifies the user of the state of the device 1.

  Next, the operation when the main microcomputer 16a of the projection type video display apparatus 1 according to the present embodiment hangs up will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the standby microcomputer 16b of the apparatus 1, and FIG. 4 is a flowchart showing the operation of the main microcomputer 16a of the apparatus 1.

  First, the operation of the standby microcomputer 16b will be described. In FIG. 3, the standby microcomputer 16b first determines whether a communication error with the main microcomputer 16a has been detected (step S1). When the standby microcomputer 16b detects a communication error in step S1 (in the case of “Y”), the main microcomputer 16a is rebooted (step S2). Thereafter, the standby microcomputer 16b transmits to the main microcomputer 16a the reason for reboot (for example, a communication error) and the state of the lamp 6 (lighted state or unlit state) immediately before the reboot to the main microcomputer 16a (step S3).

  Next, the operation of the main microcomputer 16a will be described. In FIG. 4, first, the main microcomputer 16a receives the reboot reason and the state of the lamp 6 immediately before the reboot from the standby microcomputer 16b (step S11). Next, it is determined whether or not the reboot reason received in step S11 is a communication error (step S12). When the received reboot reason is a communication error (in the case of “Y”), the process proceeds to step S13, and it is determined whether or not the lamp state immediately before the reboot is a lighting state. On the other hand, when the reboot reason received in step S11 is not a communication error (in the case of “N”), the process proceeds to step S15, where necessary processing is executed and the process ends. When the state of the immediately preceding lamp 6 is turned on in step S13 (in the case of “Y”), the main microcomputer 16a rotates the cooling fan 13 for a certain period of time via the fan drive unit 15 (step S14), and the process ends. On the other hand, if the state of the immediately preceding lamp 6 is extinguished (in the case of “N”) in step S13, the process ends without doing anything.

  In this way, when the main microcomputer 16a hangs up, if the lamp 6 is lit immediately before the hang-up, the main microcomputer 16a rotates the cooling fan 13 for a certain time after the reboot to cool the lamp 6. Therefore, it is possible to reduce a decrease in the lifetime of the lamp 6. The hang-up of the main microcomputer 16a can be easily grasped by detecting a communication error with the standby microcomputer 16b.

  As described above, according to the projection display apparatus 1 in the present embodiment, when the main microcomputer 16a hangs up due to heat or noise during the operation of the projection display apparatus 1 (while the lamp 6 is lit). However, when the main microcomputer 16a is rebooted, information indicating that a lighting state of the lamp 6 immediately before the hang-up and a communication error with the main microcomputer 16a has occurred can be acquired from the standby microcomputer 16b. Therefore, the cooling fan 13 can be appropriately controlled based on the lighting state of the lamp 6 immediately before the main microcomputer 16a is hung up. As a result, it is possible to reduce a decrease in the life of the lamp 6.

  In the description of the above embodiment, when the main microcomputer 16a hangs up, if the lamp 6 is lit immediately before the hang-up (immediately before rebooting), the main microcomputer 16a rotates the cooling fan 13 for a certain time after rebooting. Let me stop. However, when it is desired to project an image immediately after the reboot of the main microcomputer 16a, the lamp 6 may be turned on again after the cooling fan 13 is rotated for a certain time to cool the lamp 6. In this way, even when the main microcomputer 16a hangs up while projecting an image, it is possible to immediately resume image projection.

  The present invention can be widely used for a projection-type image display device such as a projector that uses a standby microcomputer with low power consumption separately from the main microcomputer.

1. Projection-type image display device (projector, this device)
DESCRIPTION OF SYMBOLS 1a Ceiling 2 Image | video input terminal 3 Image processing part 4 DMD drive part 5 DMD element 6 Discharge lamp 7 Color wheel 8 Rod integrator 9 Mirror 10 Projection lens 11 Motor 12 Motor drive part 13 Cooling fan 14 Lamp drive part 15 Fan drive part 16a Main Microcomputer 16b Standby microcomputer 17a, 17b RAM
18a, 18b Flash memory (nonvolatile memory)
DESCRIPTION OF SYMBOLS 19 Operation panel 20 Remote control receiver 21 Communication part 22 Display part 23 Remote control 24 Power supply part 30 Screen 31 Wall surface 40 Power switch 50 Input terminal 60 Personal computer (PC)
61 RS232C connection terminal

Claims (3)

A lamp for projecting images,
A projection type image display device comprising a cooling fan for cooling the lamp,
A main microcomputer for controlling the projection display device during normal operation;
A standby microcomputer for controlling the projection display device instead of the main microcomputer at the time of standby,
When the main microcomputer hangs up,
The standby microcomputer reboots the main microcomputer, and immediately after rebooting the main microcomputer sends information indicating that the lamp is on immediately before rebooting and that the reboot is a reboot after a communication error with the main microcomputer,
The main microcomputer controls the cooling fan based on the information, the projection type video display device. 2. The main microcomputer, when the lamp is lit immediately before the reboot of the main microcomputer, the rotation of the cooling fan for a predetermined time immediately after the reboot of the main microcomputer, to stop the cooling fan. The projection-type image display device described. When the lamp is lit immediately before rebooting the main microcomputer, the main microcomputer turns on the lamp after rotating the cooling fan for a predetermined time immediately after rebooting the main microcomputer. Item 4. A projection display apparatus according to Item 1.

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