JP2011035798A - Projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a system configuration and to provide a stable operation in a projection type video display device which has a standby mode and comprises a network interface. <P>SOLUTION: During a standby mode, a nonvolatile memory 20 is connected to a network microcomputer 18 and brought into an active state and receives an input from an operating panel 22 or a remote controller 28. During a projection mode, the network microcomputer 18 controls a power source section 27 to feed power to a main microcomputer 16. By this power feeding, a switch 21 connects the nonvolatile memory 20 to the main microcomputer 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection type video display apparatus such as a projector, and more particularly to a projection type video display apparatus provided with a standby mode corresponding to power saving.

  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 such as a mercury lamp as a light source. Putting the projector in the standby state while the discharge lamp is turned on consumes unnecessary power and adversely affects the life of the discharge lamp and surrounding optical components. Therefore, a normal projector stops the power supply to the discharge lamp and main circuits during standby, and has a minimum circuit such as an operation unit that receives operations from the user and a communication circuit that communicates with external devices. It has a standby mode that only supplies power.

  Most functions of the projector are controlled by a microcomputer (hereinafter abbreviated as “microcomputer”), but the processing load of the operation reception function and communication function that operate in the standby mode is relatively light. It is not efficient to operate a simple microcomputer from the viewpoint of power consumption. Therefore, in addition to the high-function main microcomputer that operates during normal operation, a low-power consumption sub-microcomputer that operates during standby (also referred to as “standby microcomputer”) is installed to reduce power consumption during standby (for example, , See Patent Document 1). A method of sharing one nonvolatile memory between two master and slave microcomputers has also been proposed (see, for example, Patent Document 2).

  Recently, projectors compatible with a network such as a LAN (Local Area Network) have been introduced for the purpose of monitoring the operating state of the projector, collecting error logs, or performing remote operation.

  Network control is often processed by a dedicated network microcomputer (hereinafter also referred to as “NT microcomputer”), which has a heavy processing load compared to serial communication control such as RS-232C.

  FIG. 4 shows the configuration of the projector including the main microcomputer, the sub microcomputer, and the NT microcomputer.

  Referring to FIG. 4, the main microcomputer 101 controls the video processing / optical system driving unit 105 in the projection mode (during normal operation). The sub-microcomputer 102 controls an input unit such as an operation panel 106, a remote control receiving unit 107, a communication terminal (RS-232C) 108, and a display unit 109 indicating the state of the apparatus. In the standby mode, the main microcomputer is in a suspending normal state, and the sub microcomputer 102 is in an operating state. The NT microcomputer 103 includes a network interface 110 such as a wireless LAN. These three microcomputers include a nonvolatile memory (EEPROM) for storing various setting data to be controlled by each microcomputer and a RAM as a work area of the microcomputer. The three microcomputers are supplied with power by the power supply unit 104. Although not shown, a flash ROM for storing program code is connected to each microcomputer.

JP 2006-308934 A JP 2006-323617 A

  However, if the configuration shown in FIG. 4 is used, the configuration becomes complicated and therefore expensive, and it is inconvenient for saving power. In order to simplify the configuration, there has been proposed a method in which two microcomputers share one nonvolatile memory as shown in Patent Document 2, for example. If the timing is irregular, the operation of the microcomputer may be hindered, and the microcomputer may not operate stably.

  The present invention has been made in view of the above, and an object of the present invention is to provide a projection-type image display apparatus that has a simple configuration and allows a microcomputer to stably operate.

  In order to achieve the above object, a projection display apparatus according to the present invention includes a main microcomputer that controls the main body during normal operation, a network microcomputer that controls network communication with external devices, and a power source for the main microcomputer and the network microcomputer. And a power supply unit that supplies a power supply unit, wherein the network microcomputer controls the projection type video display apparatus in a sleep state during standby and causes the power supply unit to stop supplying power to the main microcomputer. It is characterized by.

  With such a configuration, the network microcomputer can play the role of a conventional standby microcomputer, the configuration of the projection display apparatus can be simplified, and the power consumption of the apparatus can be reduced.

  In the projection type image display device of the present invention, there is further provided a nonvolatile memory for storing various setting data of the main microcomputer and the network microcomputer, and a switch for switching the connection of the nonvolatile memory between the main microcomputer and the network microcomputer. In addition, the switch may connect the nonvolatile memory to the main microcomputer side when power is supplied to the main microcomputer.

  With such a configuration, a single nonvolatile memory can be shared by the main microcomputer and the network microcomputer, so that the configuration of the control unit can be simplified and the power consumption of the apparatus can be further reduced.

  In the projection type video display device of the present invention, the main microcomputer includes a power monitoring terminal that generates a signal when power is supplied, and when the signal is generated at the power monitoring terminal, the switching unit stores the nonvolatile memory. It may be connected to the main microcomputer side.

  With such a configuration, it is possible to prevent the operation of the main microcomputer from becoming unstable when the projection display apparatus is switched from the standby mode to the normal operation mode (projection mode).

  According to the present invention, it is possible to provide a projection-type image display apparatus that has a simple configuration and that stably operates the main microcomputer.

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 projection type video display apparatus. It is a block diagram which shows the internal structure of the conventional projection type video display apparatus.

  Embodiments of the present invention will be described below 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 or DVD player is input to the apparatus 1 via an input terminal 50 provided on the wall surface. The user operates the remote controller 28 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 video projection unit of the present apparatus 1 performs image processing for driving the DMD element 5 on the video signal (for example, a DVD playback video) input to the video input terminal 2. The image processing unit 3, the DMD driving unit 4 for driving the DMD element 5 with the output image signal of the image processing unit 3, the discharge lamp 6 that emits high-intensity white light, and the white light from the discharge lamp 6 in three primary colors A color wheel 7 for spectrally dividing (red, green, blue) in a time-sharing manner, a rod integrator 8 for equalizing the luminance distribution, a mirror 9, a projection lens 10, and a motor 11 for rotating the color wheel 7, A motor driving unit 12 for synchronizing the rotation of the color wheel 7 with the video signal, a lamp driving unit 14 for applying a necessary voltage to the discharge lamp 6, and a cooling fan 13 for cooling the discharge lamp 6. , And a fan driving unit 15 that drives the cooling fan 13.

  The high-intensity white light generated when the discharge lamp 6 is turned on is transmitted through the color wheel 7 and dispersed into the three primary colors in a time-sharing manner. The DMD element 5 is irradiated after being irradiated and refracted. Reflected light modulated by the video signal in the DMD element 5 is magnified by the projection lens 10 and projected onto the screen 30 as an image.

  The control unit of the apparatus 1 is mainly configured by a main microcomputer 16 that controls the apparatus 1 during normal operation (projection mode) and an NT microcomputer 18 that controls the apparatus 1 during standby. Both are connected to RAMs 17 and 19, respectively. A nonvolatile memory (EEPROM) 20 such as a flash memory is configured to be connected to either the main microcomputer or the NT microcomputer by a switch 21. Although not shown, the main microcomputer 16 and the NT microcomputer 18 are connected to flash ROMs for storing program codes. The respective program codes stored in the flash ROM are expanded on the RAMs 17 and 19 and a control operation is performed.

  The main microcomputer 16 has a power supply monitoring terminal 16a that generates a signal when power is supplied to the main microcomputer 16, and the switch 21 uses the signal from the power supply monitoring terminal 16a to store the nonvolatile memory 20 in the main microcomputer 16. Connect to the side.

  The main microcomputer 16 reads various setting data stored in the nonvolatile memory 20 and controls the apparatus 1. The main microcomputer 16 communicates with the NT microcomputer 18 to control the lamp driving unit 14 and the motor driving unit 12 according to the instruction of the NT microcomputer 18 that has received an operation instruction from the user. In cooperation, it also adjusts the color and brightness of the video.

  The NT microcomputer 18 includes an operation panel 22, a remote control receiving unit 23 that receives a signal from the remote control 28, a communication unit (RS-232C) 24 that communicates with an external device such as an external personal computer 60, and the device 1. A display unit 25 that displays the status using LEDs or the like, a network interface (network I / F) 26, and the fan drive unit 15 are connected.

  During the period when the power switch 40 is on, the NT microcomputer 18 is always supplied with power by the power supply unit 27 and reads various setting data stored in the nonvolatile memory 20 to control the apparatus 1. To do. Further, the NT microcomputer 18 continues the sleep state until an operation instruction from the user is received, and the power consumption is minimized.

  The NT microcomputer 18 has a function of instructing the power supply unit 27 to control power supply to the main microcomputer 16.

  In the standby mode, the NT microcomputer 18 stops power supply to the main microcomputer 16 and issues a power supply start instruction when receiving an input instruction for the projection mode.

  Next, the operation of the projection display apparatus 1 in the embodiment of the present invention will be described with reference to FIGS. 1 and 2 and FIG.

  When the power switch 40 is turned on in step S1, power is supplied to the NT microcomputer 18 in step S2. At this time, the nonvolatile memory 20 is connected to the NT microcomputer 18, and after the NT microcomputer 18 reads various setting data stored in the nonvolatile memory 20, the apparatus 1 enters the standby mode. In this state, the NT microcomputer 18 continues the sleep state and waits for a user operation instruction.

  In step S3, when the user operates the operation panel 22 or the remote control device 28 to select the projection mode, the NT microcomputer 18 drives the fan drive unit 15 in step S4 and pauses the access work to the nonvolatile memory 20. At the same time, the power supply unit 27 is controlled to supply power to the main microcomputer 16. Next, in step S5, a signal is generated at the power monitoring terminal 16a of the main microcomputer 16. In step S6, the switch 21 connects the nonvolatile memory 20 to the main microcomputer 16 side by a signal from the power monitoring terminal 16a. In step S7, the main microcomputer 16 reads various setting data stored in the non-volatile memory 20, and drives each element of the projection video unit described above in addition to the lamp driving unit 14 and the motor driving unit 12. The device 1 enters the projection mode. In this projection mode, a video image input from the image input terminal and an image input from the network interface 26 can be projected onto the screen 30. Further, an instruction such as image quality adjustment of the projected image by operation of the operation panel 22 or the remote control device 28 is transmitted from the NT microcomputer 18 to the main microcomputer 16, and the main microcomputer 16 is related to image quality adjustment stored in the nonvolatile memory 20. The image processing unit 3 is controlled with reference to the data.

  Next, when the operation panel 22 or the remote control device 28 is operated in step S8 and the end of the projection mode is selected, the NT microcomputer 18 notifies the main microcomputer 16 in step S9. In step S10, the main microcomputer 16 stops the driving of each element of the projection video unit in addition to the lamp driving unit 14 and the motor driving unit 12 described above, and performs a projection end process. In step S11, the projection end process ends. This is notified to the NT microcomputer 18. In the next step S12, the NT microcomputer 18 controls the power supply unit 27 to stop the power supply to the main microcomputer 16. As a result, the signal of the power supply monitoring terminal 16a disappears, and the switch 21 connects the nonvolatile memory 20 to the NT microcomputer 18 in the next step S13. In the next step S14, the NT microcomputer 18 performs the same operation as in step S2, and the apparatus 1 enters the standby mode.

  The fan drive unit 15 stops operating after a predetermined time.

  As described above, the projection display apparatus 1 of the present embodiment allows the NT microcomputer 18 to have a standby mode function and shares the nonvolatile memory 20 that stores various setting data of the microcomputer with the main microcomputer 16. To do. When the NT microcomputer 18 receives an instruction of the projection mode, the main microcomputer 16 is supplied with power, and the switch 21 connects the nonvolatile memory 20 to the main microcomputer 16 by this power supply. As a result, the system configuration is simplified and the operation of the main microcomputer 16 can be performed stably.

  In the above embodiment, an example in which DMD is used as an optical display element has been described. However, an LCD (liquid crystal display element) may be used as the optical display element.

  The present invention can be widely used not only for projection-type image display devices such as projectors but also for general devices having a power-saving standby mode that uses a low-power consumption network microcomputer 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 16 Main Microcomputer 16a Power supply monitoring terminal 17 RAM
18 Network microcomputer (NT microcomputer)
19 RAM
20 Nonvolatile memory (EEPROM)
21 Switch 22 Operation Panel 23 Remote Control Receiver 24 Communication Terminal (RS-232C)
25 Display Unit 26 Network Interface (Network I / F)
27 Power supply unit 28 Remote control device 30 Screen 31 Wall surface 40 Power switch 50 Input terminal 60 Personal computer

Claims (3)

A main microcomputer that controls the main unit during normal operation;
A network microcomputer that controls network communication with external devices;
A power supply unit for supplying power to the main microcomputer and the network microcomputer;
In a standby mode, the network microcomputer controls the projection type video display apparatus in a sleep state, and causes the power supply unit to stop supplying power to the main microcomputer. One nonvolatile memory for storing various setting data of the main microcomputer and the network microcomputer;
A switch for switching the connection of the nonvolatile memory to the main microcomputer and the network microcomputer;
The projection type video display device according to claim 1, wherein when the power is supplied to the main microcomputer, the switch connects the nonvolatile memory to the main microcomputer side. The main microcomputer includes a power monitoring terminal that generates a signal when power is supplied, and the switch connects the nonvolatile memory to the main microcomputer when a signal is generated at the power monitoring terminal. The projection type image display device according to claim 2, wherein

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