KR101372937B1 - Monitoring device for dlp projection system - Google Patents

Abstract

The present invention provides a monitoring device of a digital light processor (DLP) projection system capable of tracking a location of a failure point and observing malfunction or damage of an equipment and damage or robbery of a lamp. The monitoring device of the DLP projection system comprises: an image signal conversion means for transmitting an inputted image signal to a DLP projector by converting the inputted image signal into an output signal of digital visual interface (DVI)-D signal; a monitoring control means for extracting R, G, B values and an effective image signal measurement value from the output signal; a voltage/current detecting means which detects a voltage and a current for an external power source to provide the monitoring control means; a display for displaying an output data of the monitoring control means; and a theft detection unit for detecting the DLP projection system being separated from the external power source. [Reference numerals] (110) Image signal conversion means; (120) DLP projector; (130) Central control means; (150) Display; (160) Central server; (AA) Theft detection unit; (BB) Image signal

Description

DLP projection system monitoring device {MONITORING DEVICE FOR DLP PROJECTION SYSTEM}

The present invention relates to a DLP projection system monitoring apparatus, and more particularly, to a DLP projection system monitoring apparatus capable of monitoring the operating state, failure state and theft state of the DLP projection system.

Digital Light Processor (DLP) is a new display method that contrasts with Liquid Crystal Display (LCD) projection system and realizes high definition image quality by using light reflecting element. In other words, DLP is a technology that expresses high brightness and high resolution images by selectively reflecting light using a device in which hundreds of thousands of reflective elements are integrated on one chip. DLP is an extension of the projection type screen display technology that has been developed through projectors, CRTs, and liquid crystal displays (LCDs), but has a characteristic of being reflective compared to LCDs already commercially available.

The DLP consists of signal processing chips for controlling each mirror of the DMD, centered on a digital micro-mirror device (DMD) in which millions of micro mirrors matching the display resolution are integrated.

DMD chips are fabricated using a semiconductor process, with hundreds of thousands to millions of mirrors of 16 x 16 µm in the area of the thumb-sized chip. In the case of a high definition signal, an analog-to-digital (A / D) converted video signal is typically composed of 1280 pixels in the horizontal direction and 720 lines in the vertical direction. The converted video signal corresponds to the micromirror of each pixel one-to-one to control the on / off state of the mirror, and to maintain the on state of the mirror, which simply turns on / off to express the brightness of the pixel. To control.

In the case of displaying a black and white image, the refresh period of the 60 Hz image is 1/60 seconds, which is about 16 mSec. According to the image signals of the mirrors within this time, the ON state time is the longest when expressing the brightest light of 16mSec, and the shortest time is when expressing the dark light of 0mSec. When 8mSec is on, it expresses light of medium brightness.

When describing a color image using one DMD chip, pure white RGB light is generated by passing white light from a white lamp through a color wheel coated with an RGB filter. For example, when the RGB filter is divided into three parts, when the color wheel is rotated at 60 Hz corresponding to the refresh rate of the image, the time for the primary color light to shine is about 5.5 mSec. After decomposing the video signal into RGB, A / D conversion, each pixel is decomposed into RGB values, and then converted into data capable of driving the DMDM, and matching the moment when the primary color light passing through the color wheel illuminates the DMDM. Color images are implemented by turning on / off the DMDM according to the pixel value of the corresponding color. The RGB colors are displayed at the same time, not at the same time, but the colors are added by speeding up the color wheel to take advantage of the afterimage effect.

The DLP projection system enclosure of a conventional DLP projection system includes a video signal converter, and a DLP projector. The video signal converter converts various input video signals such as VGA, RGBHV, DVI, BNC composite video, and S-Video into DVI (Digital Visual Interface) -D signals and transmits them to the DLP projector. The DLP projector projects an image on a screen using a DVI-D type video signal received from a video signal converter.

However, according to the conventional DLP projection system, it is difficult to track the cause of failure when screen image is disconnected. That is, it is difficult to determine whether the failure is due to a DLP projector, a video signal converter, a video signal connection cable, or a power supply failure when an image is not implemented on the screen. In addition, there is no detection of the surrounding environment inside the enclosure, and only the manual management of the operator is required.

Therefore, when using a conventional DLP projection system, it takes a lot of time and manpower to check and manage the failure, there is a problem that can not respond quickly and accurately when there is a change in the image quality or the surrounding environment.

On the other hand, if the DLP projection system is stolen, there is no means to understand this, there is a disadvantage that can not quickly deal with.

It is an object of the present invention to provide a DLP projection system monitoring apparatus capable of monitoring a location of a failure point by monitoring a real-time video signal.

In addition, another object of the present invention is to provide a DLP projection system monitoring apparatus capable of monitoring a supply voltage of a DLP projection system enclosure to determine whether a device malfunctions or is damaged due to a change in supply voltage.

In addition, another object of the present invention is to provide a DLP projection system monitoring apparatus capable of monitoring the power consumption of the DLP projection system enclosure and determining whether the lamp inside the DLP projector is damaged according to the change in the power consumption.

Another object of the present invention is to provide a DLP projection system monitoring apparatus capable of real-time monitoring of collected information by central control of a central server.

Another object of the present invention is to provide a DLP projection system monitoring apparatus capable of monitoring theft from an installation point and informing the central server of theft information.

The monitoring apparatus of the DLP projection system according to the present invention, in the monitoring apparatus of the DLP projection system, converts an input video signal into an output signal of a DVI (Digital Visual Interface) -D signal and transmits it to a DLP (Digital Light Processor) projector. Video signal conversion means; Supervisory control means for extracting R, G, B values and effective video signal measured values from an output signal of the video signal converting means; Voltage / current detection means for detecting a voltage and a current with respect to an external power source supplied to the DLP projection system and providing the voltage to the supervisory control means; A display for displaying output data of the monitoring control means; And a burglar detection unit connected to a power line to which the external power is supplied, for detecting that the DLP projection system is separated from the external power source, wherein the burglar detection unit includes first to third terminals a1, b1, and c1. The first terminal (a1) is grounded through the ground line and the conductive line of the power line, the second terminal (b1) and the third terminal (c1) is a first connector connected via a conductive line; A second connector electrically and physically coupled to the first connector, the second connector including first to third terminals a2, b2 and c2, the third terminal c2 being connected to a ground side; A power separation signal generator configured to generate a power separation signal by detecting separation from the power line; A takeover signal generation unit connected to the first terminal (a2) of the second connector and detecting a separation from the ground line to generate a takeover signal; And a detection signal generation unit including a connector separation signal generation unit generating a connector separation signal by detecting that the first connector and the second connector are separated from each other. And a microcontroller including the identification signal of the DLP projection system in the signals output from the detection signal generator and outputting the signal to the transceiver.

Preferably, the regulator for receiving a voltage of the external power source for outputting a voltage of a predetermined magnitude; A diode disposed at an output of the regulator and preventing electric energy from flowing into the regulator; A charging unit generating a charging voltage required to charge an internal battery by using the output of the regulator; A voltage detector configured to output a first level voltage when the regulator output voltage is greater than or equal to a predetermined magnitude, and output a second level voltage different from the first level voltage when less than the predetermined magnitude; And a power switching element that is controlled by an output of the voltage detector and is connected to the external power source to block electric energy discharge of the internal battery and to discharge electric energy of the internal battery when separated from the external power source. The power separation signal generation unit may include: a voltage divider configured to divide the voltage of the external power supplied through the power line; And a capacitor connected in parallel to a resistor connected to a ground side of the voltage divider resistor, wherein the deodorization signal generator includes: a first PNP transistor disposed between a power supply voltage terminal and the ground line; And a first diode connected to the base terminal of the first PNP transistor and the first terminal (a2) of the second connector, wherein the connector disconnection signal generating unit is disposed between the power supply voltage terminal and the housing of the DLP projection system. A second PNP transistor disposed in the; And a second diode connected to the base terminal of the second PNP transistor and the second terminal b2 of the second connector.

The DLP projection system monitoring apparatus according to the present invention can track the location of a failure point, determine whether the device is malfunctioning or damaged due to a change in supply voltage, and determine whether the lamp inside the DLP projector is damaged. Therefore, the operation is very convenient. In addition, it is possible to monitor in real time the information collected by the central control of the central server. In addition, since theft can be monitored from the installation point and theft information can be informed to the central server, the response can be promptly performed.

1 is a block diagram of a monitoring system of the DLP projection system monitoring apparatus according to an embodiment of the present invention,
2 is a detailed block diagram of a DLP projector of a DLP projection system monitoring apparatus according to an embodiment of the present invention;
3 is a detailed block diagram of a monitoring control unit of a DLP projection system monitoring apparatus according to an embodiment of the present invention;
4 is a circuit diagram of a theft detection unit of the DLP projection system monitoring apparatus according to an embodiment of the present invention, and
5 is a power supply voltage supply circuit diagram of the theft detection unit of the DLP projection system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular embodiments, It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the scope. It should also be understood that various equivalents and modifications may be substituted for those at the time of the present application.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. ≪ / RTI >

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a block diagram of a monitoring system of a DLP projection system monitoring apparatus according to an embodiment of the present invention.

The DLP projection system enclosure 100 includes an image signal converter 110, a DLP projector 120, a central control unit 130, a potential transformer / current transformer 140, and a display 150. ).

The video signal converter 110 converts various input video signals such as VGA, RGBHV, DVI, BNC composite video, and S-Video into a DVI (Digital Visual Interface) -D signal to convert the DLP projector 120 and the central controller 130. Will output The DLP projector 120 projects an image on a screen using a DVI-D type image signal input from the image signal converter 110.

2 is a detailed block diagram of a DLP projector of a DLP projection system monitoring apparatus according to an exemplary embodiment of the present invention. The DLP projector 120 includes an optical engine unit and a data processor 210. In addition, the data processor 210 includes a microprocessor 211, a memory unit 212, an index delay setting unit 213, a phase difference detector 214, a PWM control signal generator 315, and a data formatter 216. do. The optical engine unit includes a DMD 221, a prism 222, a projection lens 223, a lamp 224, a color wheel 225, a motor 226, a sensor 227, a motor driver 228, and a ballast control unit 229. ).

The microprocessor 211 generally controls the optical engine unit and the data processor 210 of the DLP projector, and the memory unit 212 stores a processing program and various information of the microprocessor 211.

The data formatter 216 receives the image data, which is an output signal of the image signal converter 110, and a synchronization signal, encodes the PWM bit sequence signal, which is a format capable of driving the DMD 221, into a DMD. 221.

The micro mirror of DMD 221 is turned on or off according to the PWM bit sequence signal. The micromirrors of the DMD 221 move the angle of the mirror by ± 15 ° depending on the on or off state.

Light emitted from the lamp 224 passes through the color wheel 225 to the prism 222, light passing through the prism 222 is provided to the DMD 221, the on of the micro mirrors of the DMD 221. Alternatively, it is reflected by the off state and provided to the projection lens 223.

The light provided from the DMD 322 is enlarged by the projection lens 223 so that an image is displayed on the screen 330. On the other hand, the light reflected through the prism 222 is reflected in the effective screen when the micro mirror is on, and the light reflected through the prism 222 is reflected outside the effective screen when the micro mirror is on.

The ballast control unit 229 provides driving power to the lamp 224 under the control of the microprocessor 211. The sensor 227 includes a photo sensor, a signal converter, and the like, and senses a color wheel index mark (CWIM) marked on the color wheel 225 through the photo sensor to sense the driving state of the color wheel 225. The signal is converted into a digital signal and provided to the index delay setting unit 213 and the microprocessor 211.

The index delay setting unit 213 delays the CWIM sensing signal provided by the sensor 227 to the phase difference detection unit 214 under the control of the microprocessor 211. The phase difference detector 214 detects the phase difference by comparing the synchronization signal with the CWIM signal, and provides the detected phase difference to the PWM control signal generator 215. The PWM control signal generator 215 receives the detected phase difference information, generates a PWM control signal for correcting the phase difference, and provides the same to the motor driver 228. The motor driver 228 drives the motor 226 that rotates the color wheel 225 according to the PWM control signal of the PWM control signal generator 215.

On the other hand, referring to Figure 2, the central control unit 130 is composed of a single board, and receives the DVI-D signal from the image signal converter 110 through the DVI-D signal input terminal of the four channels and the RGB value and effective Extract the video signal measurements. The effective video signal measurement value is calculated using the horizontal synchronizing signal and the vertical synchronizing signal. The central control unit 130 displays the extracted RGB value and the effective image signal measurement value through the display 150 mounted in the DLP projection system enclosure 100.

In addition, the central control unit 130 includes two input connectors to receive a voltage value and a current value of a 220 VAC power supply supplied to the DLP projection system enclosure 100. The PT / CT 140 detects the voltage and current at the first input terminal of the 220 VAC power supplied to the DLP projection system enclosure 100, converts the voltage and the current into a low level signal, and provides the same to the central controller 130. . The detected voltage is recorded when it is out of the range of the programmed reference value, and the central controller 130 displays the detected voltage on the display 150. The operator can use this to track the cause of equipment malfunctions and damages caused by abnormal variations in supply. In addition, the central controller 130 displays the detected current value through the display 150, and the operator compares the detected current value with a reference current setting value by the initial operating current, thereby checking whether the lamp 224 is damaged or not. You can judge.

Thus, the operator can easily determine the cause of the failure of the DLP projection system using the information displayed on the display 150. For example, when the image is not displayed on the screen, if the RGB measurement value, the effective image signal measurement value, the detected voltage and current are normal, the connection cable between the image signal converter 110 and the DLP projector 120 It can be estimated that there is this abnormality. In addition, when the image is not displayed on the screen, the RGB measurement value or the effective video signal measurement value is abnormal, and the detected voltage and current are normal, the video signal converter 110 or the video signal is sent to the video signal converter 110. It is likely that there is something wrong with the input cable.

3 is a detailed block diagram of the monitoring control unit of the DLP projection system monitoring apparatus according to an embodiment of the present invention, wherein the central control unit 130 converts various video signals converted into DVI-D signals by the video signal converter 110. Are input via 4 channel DVI-D signal input terminal. The RGB extracting units 310a, 310b, 310c, and 310d extract R, G, and B values and valid video signal measurement values from the DVI-D signal and transmit them to the control unit 320. Techniques for extracting R, G, B values and effective video signal measurements from DVI-D signals are already well known conventional techniques and will not be described further.

The central controller 130 displays the extracted RGB value and the effective image signal measurement value through the display 150 mounted on the rear side of the DLP projection system enclosure 100. In addition, the controller 320 displays the voltage and current values detected at the first input terminal of the 220 VAC power supplied to the DLP projection system enclosure 100 through the display 150. The operator may determine whether the device is damaged due to an abnormal power supply, as a history function, and may also determine whether the lamp 224 is damaged according to the change in power consumption.

Meanwhile, referring to FIG. 2, various information displayed on the display 150 may be provided to the central server 160 through an Ethernet communication connection. This allows the operator to remotely identify the presence and cause of failures in the DLP projection system. In particular, the operator can remotely and in real time determine the failure and the cause of the plurality of DLP projection system distributed in each region in the central server 160.

4 is a circuit diagram of a theft detection unit of the DLP projection system monitoring apparatus according to an embodiment of the present invention, the first connector 410, the second connector 420, the detection signal generator 430, the MCU 440, Transceiver 450, and antenna 460.

The first connector 410 includes at least three first to third terminals a1, b1, and c1, wherein terminal a1 is grounded by the vehicle body and the conductive line, and terminal b1 is coupled by the terminal c1 with the conductive line. do.

The second connector 420 includes at least three first to third terminals a2, b2, and c2, and may be electrically and physically coupled to the first connector 410.

The detection signal generator 430 detects the separation from the external power source, and generates a power separation signal generator 431 for generating a power separation signal. The detection signal generator 430 detects that the DLP projection system is separated from the ground line and generates a takeover signal. A portion 433 and a connector disconnection signal generator 435 which detects that the first connector and the second connector are separated and generates a connector disconnection signal.

The power split signal generator 431 includes voltage divider resistors R11 and R12 for dividing the voltage of the supplied power, and a capacitor C1 connected to the resistor R12 in parallel to maintain voltages at both ends. In normal operation, the power disconnection signal SPo maintains the "H" level by the voltage between the both ends of the resistor R12. However, when the power supply is cut off, the power disconnection signal Spo transitions to the "L" level.

The deodorization signal generator 433 includes a PNP transistor Tr1 disposed between the power supply voltage Vcc and the ground line of the power supply line, and a diode D1 coupled between the base terminal of the PNP transistor Tr1 and the ground line of the power supply line. .

In normal operation, the base terminal of the PNP transistor Tr1 is connected to the ground line side of the power supply line through the diode D1, the first terminal a2 of the second connector, and the first terminal a1 of the first connector, Since the transistor Tr1 is turned on, the takeover signal Strap maintains the "H" level. However, when the conductive line connected to the first terminal a1 of the first connector 410 is separated from the ground line of the power line, the PNP transistor Tr1 is turned off, so that the takeover signal Strap transitions to the "L" level.

The connector disconnection signal generator 435 is disposed between the PNP transistor Tr2 and the base terminal of the PNP transistor Tr2 and the DPL projection system enclosure 200 disposed between the power supply voltage Vcc and the DPL projection system enclosure 200. A diode D2 to be coupled.

In the normal operation in which the first connector 410 and the second connector 420 are coupled, the base terminal of the PNP transistor Tr2 is the diode D2, the second terminal b2 of the second connector, and the first connector first. The PNP transistor Tr2 is connected to the DPL projection system enclosure 200 through the second terminal b1, the conductive wire, the first terminal a1 of the first connector, and the first terminal a2 of the second connector. As it is turned on, the connector disconnect signal Sconn remains at " H " level. However, when the first connector 410 and the second connector 420 are separated from each other, since the NP transistor Tr2 is turned off, the connector disconnection signal Scon transitions to the "L" level.

The MCU 440 includes the identification signal of the DLP projection system in the signals output from the detection signal generator 430 and outputs the identification signal to the transceiver 450. Although not shown, according to an embodiment of the present invention, the central server uses the identification number and the detection signal of the DLP projection system at which point the DLP projection system is disconnected from the power supply, and at which point the DLP is installed. The projection system can determine whether the ground wire is disconnected or which connector of the DLP projection system is disconnected.

On the other hand, even if the theft detection unit 170 of the monitoring device of the DLP projection system according to an embodiment of the present invention is separated from the external power source, the power supply to the transistor of the deodorization signal generator 433 and the connector disconnection signal generator 435 Voltage needs to be applied.

5 is a power supply voltage supply circuit diagram of a theft detection unit of the DLP projection system according to the present invention, including a regulator 501, a diode 502, a charging unit 503, a voltage detector 504, a built-in battery 505, a power switching element. 510, and a power supply voltage output unit 506.

The regulator 501 receives a vehicle battery voltage having various voltages (7 to 42V) according to the amount of charge and outputs a voltage (4.7V) having a predetermined magnitude.

The diode 502 prevents the flow of electrical energy to the regulator 501 side. That is, electric energy flows from the built-in battery 505 to the power supply voltage output unit 506, which will be described later, and prevents the introduction into the regulator 501.

The charging unit 503 generates a charging voltage required to charge the internal battery 505 using the output of the regulator 501.

When the output voltage of the regulator 501 is 4.7 V or more, the voltage detector 504 has an "H" level equal to the output voltage of the regulator 501 at the gate terminal G of the P-channel power FET 511 which is a voltage control switching element. By supplying a voltage to turn off the power FET 511, the electrical energy of the built-in battery 505 is prevented from being discharged. When the output voltage of the regulator 240 is less than 4.7V, the "L" level voltage (0V) is supplied. As a result, the P-channel power FET 511 is turned on to discharge the electric energy of the built-in battery 505.

In the case of normally connected to an external power source, the power supply voltage Vcc is output through the regulator 501, the diode 502, and the power supply voltage output unit 506, and the built-in battery 505 is provided through the charging unit 503. ).

However, when disconnected from the external power source, the regulator 501 and the charging unit 503 stop operation, and the voltage detector 504 outputs an "L" level voltage so that the P-channel power FET 511 is turned on so that the built-in battery is turned on. Electrical energy of 505 is discharged through power supply voltage output unit 506.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications and variations are possible within the scope of the appended claims.

100: DLP projection system enclosure 110: video signal converter
120: DLP projector 130: central control unit
140: PT / CT 150: display
160: central server 170: theft detection unit
210: data processor 211: microprocessor
212: memory unit 213: index delay setting unit
214: phase difference detector 215: PWM control signal generator
216: data formatter 221: DMD
222: prism 223: projection lens
224: lamp 225: color wheel
216: motor 227: sensor
228: motor drive unit 229: ballast control unit
310a, 310b, 310c, 310d: RGB extraction unit 320: control unit
410: first connector 420: second connector
430: detection signal generator 431: power disconnect signal generator
433: takeover signal generator 435: connector disconnection signal generator
440: MCU 450: transceiver
460: antenna 5011: regulator
502: diode 503 charging section
504: voltage detector 505: built-in battery
506: power supply voltage output unit 510: power switching element
511: FET

Claims (2)

In the monitoring device of the DLP projection system,
Image signal conversion means for converting an input image signal into an output signal of a DVI (Digital Visual Interface) -D signal and transmitting the same to a digital light processor (DLP) projector;
Supervisory control means for extracting R, G, B values and effective video signal measured values from an output signal of the video signal converting means;
Voltage / current detection means for detecting a voltage and a current with respect to an external power source supplied to the DLP projection system and providing the voltage to the supervisory control means;
A display for displaying output data of the monitoring control means; And
A burglar detection unit connected to a power line to which the external power is supplied and detecting that the DLP projection system is separated from the external power source,
The theft detection unit,
First to third terminals a1, b1, and c1, wherein the first terminal a1 is grounded through a ground line and a conductive line of the power line, and the second terminal b1 and the third terminal ( c1) includes a first connector connected through a conductive line;
A second connector electrically and physically coupled to the first connector, the second connector including first to third terminals a2, b2 and c2, the third terminal c2 being connected to a ground side;
A power separation signal generator configured to generate a power separation signal by detecting separation from the power line; A takeover signal generation unit connected to the first terminal (a2) of the second connector and detecting a separation from the ground line to generate a takeover signal; And a detection signal generation unit including a connector separation signal generation unit generating a connector separation signal by detecting that the first connector and the second connector are separated from each other. And
A microcontroller including an identification signal of the DLP projection system in the signals output from the detection signal generator to output to the transceiver
DLP projection system monitoring device comprising a. The method of claim 1,
A regulator for receiving a voltage of the external power supply and outputting a voltage having a predetermined magnitude;
A diode disposed at an output of the regulator and preventing electric energy from flowing into the regulator;
A charging unit generating a charging voltage required to charge an internal battery by using the output of the regulator;
A voltage detector configured to output a first level voltage when the regulator output voltage is greater than or equal to a predetermined magnitude, and output a second level voltage different from the first level voltage when less than the predetermined magnitude; And
A power switching element that is controlled by an output of the voltage detector and is connected to the external power source to block the discharge of electrical energy of the internal battery and to discharge the electrical energy of the internal battery when separated from the external power source
Further comprising, the power separation signal generator,
A voltage divider for dividing the voltage of the external power supplied through the power line; And
A capacitor connected in parallel to a resistor connected to a ground side of the voltage divider resistor
Includes, the deodorizing signal generation unit,
A first PNP transistor disposed between a power supply voltage terminal and the ground line; And
A first diode connected to the base terminal of the first PNP transistor and the first terminal a2 of the second connector
Includes, the connector separation signal generation unit,
A second PNP transistor disposed between the power supply voltage terminal and the housing of the DLP projection system; And
A second diode connected to the base terminal of the second PNP transistor and the second terminal b2 of the second connector;
DLP projection system monitoring device comprising a.

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