JP2007183390A - Video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a thin and lightweight video display device, such as a plasma display device, of which a theft is deterred by configuring the device in such a manner that a person other than the original user cannot normally use the device. <P>SOLUTION: The video display device is so configured as to limit or prohibit the output of an input video/or speech when the detection of the standby current of the video display device is performed and when the power source of the video display device is turned on by way of the state that the standby current is not detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display device having an anti-theft function, and is particularly useful for a large-screen, thin and light image display device such as a liquid crystal television and a plasma display device.

  For example, video display devices such as plasma display devices and liquid crystal televisions are suitable as large screen video display devices because they are thinner and lighter than CRTs.

  In particular, the plasma display device is simple in structure, manufacturing method, and capable of high-speed display as compared with a liquid crystal television, has a wide viewing angle, is easy to enlarge, and is self-luminous. Due to its high display quality, it has recently attracted particular attention among large-screen video display devices. As a video display device in a place where many people gather, and enjoy large-screen video at home. As a video display device for this purpose, it is used for various purposes.

The plasma display panel as a display device used in the plasma display apparatus is roughly divided into an AC type and a DC type in terms of driving, and there are two types of discharge types: a surface discharge type and a counter discharge type. However, from the viewpoint of high definition, large screen, and easy manufacturing, a surface discharge type with a three-electrode structure is currently the mainstream. In this plasma display device, a plasma display panel constituted by a glass plate is held on the front side of a metal chassis member such as aluminum, and a drive circuit for causing the panel to emit light on the rear side of the chassis member is configured. A module configured by arranging a circuit board to be used is used (see Patent Document 1).
JP 2003-131580 A

  By the way, video display devices such as plasma display devices may be stolen while an administrator is absent, for example, when they are installed in a public place because of their thin and lightweight features. there were.

  The present invention has been made in view of such a situation, and an object of the present invention is to realize a video display device that suppresses theft by making normal use impossible after theft.

  In order to solve this problem, the video display device of the present invention detects the standby current of the video display device, and when the power of the video display device is turned on after the standby current is not detected, And / or a video display device configured to limit or prohibit the output of audio.

  According to the present invention, it is possible to realize a video display device that cannot be used normally after being stolen and thus can be prevented from being stolen.

  According to the first aspect of the present invention, when the standby current of the video display device is detected and the standby current is not detected, and the power of the video display device is turned on, the input video and / or audio The video display device is configured to limit or prohibit the output of the video.

  According to the second aspect of the present invention, in the first aspect of the invention, when the operation is performed so as to restrict or prohibit the output of the input video and / or audio, the state is determined by a predetermined operation. It is configured so that it can be released.

  Hereinafter, an image display apparatus according to an embodiment of the present invention will be described using a plasma display apparatus as an example with reference to FIGS. 1 to 9, but the embodiment of the present invention is not limited thereto.

  First, the structure of a plasma display panel (hereinafter also referred to as a panel) in a plasma display device will be described with reference to FIG. As shown in FIG. 1, the panel is configured by disposing a glass front substrate 1 and a back substrate 2 so as to form a discharge space therebetween. On the front substrate 1, a plurality of scanning electrodes 3 and sustaining electrodes 4 constituting display electrodes are formed in parallel with each other. A dielectric layer 5 is formed so as to cover the scan electrode 3 and the sustain electrode 4, and a protective layer 6 is formed on the dielectric layer 5.

  A plurality of data electrodes 8 covered with an insulator layer 7 are provided on the back substrate 2, and a grid-like partition wall 9 is provided on the insulator layer 7. A phosphor layer 10 is provided on the surface of the insulator layer 7 and on the side surfaces of the partition walls 9. The front substrate 1 and the rear substrate 2 are arranged to face each other so that the scan electrodes 3 and the sustain electrodes 4 and the data electrodes 8 cross each other, and in the discharge space formed between them, for example, neon And a mixed gas of xenon. Note that the structure of the panel is not limited to the above-described structure, and for example, a structure having a stripe-shaped partition may be used.

  FIG. 2 is an electrode array diagram of this panel. N scan electrodes SC1 to SCn (scan electrode 3 in FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrode 4 in FIG. 1) are arranged in the row direction, and m data electrodes D1 to D1 are arranged in the column direction. Dm (data electrode 8 in FIG. 1) is arranged. A discharge cell is formed at a portion where a pair of scan electrode SCi and sustain electrode SUi (i = 1 to n) and one data electrode Dj (j = 1 to m) intersect, and the discharge cell is in the discharge space. M × n are formed.

  FIG. 3 is a circuit block diagram of a plasma display device using this panel. The plasma display device includes a panel 11, an image signal processing circuit 12, a data electrode drive circuit 13, a scan electrode drive circuit 14, a sustain electrode drive circuit 15, a timing generation circuit 16, and a power supply circuit (not shown).

  The image signal processing circuit 12 converts the image signal sig into image data for each subfield. The data electrode drive circuit 13 converts the image data for each subfield into signals corresponding to the data electrodes D1 to Dm, and drives the data electrodes D1 to Dm. The timing generation circuit 16 generates various timing signals based on the horizontal synchronization signal H and the vertical synchronization signal V, and supplies them to each drive circuit block. Scan electrode drive circuit 14 supplies drive voltage waveforms to scan electrodes SC1 to SCn based on timing signals, and sustain electrode drive circuit 15 supplies drive voltage waveforms to sustain electrodes SU1 to SUn based on timing signals. Here, the scan electrode drive circuit 14 and the sustain electrode drive circuit 15 include a sustain pulse generator 17.

  Next, a driving voltage waveform for driving the panel and its operation will be described with reference to FIG. FIG. 4 is a diagram showing drive voltage waveforms applied to the respective electrodes of the panel.

  In the plasma display device according to the present embodiment, one field is divided into a plurality of subfields, and each subfield has an initialization period, an address period, and a sustain period.

  In the initializing period of the first subfield, the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn are held at 0 (V), and from the voltage Vi1 (V) that is lower than the discharge start voltage with respect to the scan electrodes SC1 to SCn A ramp voltage that gradually increases toward the voltage Vi2 (V) exceeding the discharge start voltage is applied. Then, the first weak initializing discharge is caused in all the discharge cells, negative wall voltages are stored on scan electrodes SC1 to SCn, and positive walls on sustain electrodes SU1 to SUn and data electrodes D1 to Dm. The voltage is stored. Here, the wall voltage on the electrode refers to a voltage generated by wall charges accumulated on the dielectric layer or the phosphor layer covering the electrode.

  Thereafter, sustain electrodes SU1 to SUn are maintained at positive voltage Vh (V), and a ramp voltage that gradually decreases from voltage Vi3 (V) to voltage Vi4 (V) is applied to scan electrodes SC1 to SCn. Then, the second weak initializing discharge is caused in all the discharge cells, the wall voltage between scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn is weakened, and the wall voltage on data electrodes D1 to Dm is reduced. Is also adjusted to a value suitable for the write operation.

  In the subsequent address period, scan electrodes SC1 to SCn are temporarily held at Vr (V). Next, negative scan pulse voltage Va (V) is applied to scan electrode SC1 in the first row, and data electrode Dk (k = 1 to 1) of the discharge cell to be displayed in the first row among data electrodes D1 to Dm. A positive write pulse voltage Vd (V) is applied to m). At this time, the voltage at the intersection between the data electrode Dk and the scan electrode SC1 is obtained by adding the wall voltage on the data electrode Dk and the wall voltage on the scan electrode SC1 to the externally applied voltage (Vd−Va) (V). And the discharge start voltage is exceeded. Then, an address discharge occurs between data electrode Dk and scan electrode SC1 and between sustain electrode SU1 and scan electrode SC1, and a positive wall voltage is accumulated on scan electrode SC1 of this discharge cell, and on sustain electrode SU1. And a negative wall voltage is also accumulated on the data electrode Dk.

  In this manner, an address operation is performed in which address discharge is caused in the discharge cells to be displayed in the first row and wall voltage is accumulated on each electrode. On the other hand, the voltage at the intersection of the data electrodes D1 to Dm and the scan electrode SC1 to which the address pulse voltage Vd (V) is not applied does not exceed the discharge start voltage, so that address discharge does not occur. The above address operation is sequentially performed until the discharge cell in the nth row, and the address period ends.

  In the subsequent sustain period, positive sustain pulse voltage Vs (V) is applied to scan electrodes SC1 to SCn as a first voltage, and ground potential, that is, 0 (V) is applied to sustain electrodes SU1 to SUn as a second voltage. Apply. In the discharge cell in which the address discharge has occurred at this time, the voltage between scan electrode SCi and sustain electrode SUi is the sustain pulse voltage Vs (V), the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi. Is added and exceeds the discharge start voltage. Then, a sustain discharge occurs between scan electrode SCi and sustain electrode SUi, and the phosphor layer emits light due to the ultraviolet rays generated at this time. Then, a negative wall voltage is accumulated on scan electrode SCi, and a positive wall voltage is accumulated on sustain electrode SUi. At this time, a positive wall voltage is also accumulated on the data electrode Dk.

  In the discharge cells in which no address discharge has occurred in the address period, no sustain discharge occurs, and the wall voltage at the end of the initialization period is maintained. Subsequently, 0 (V) that is the second voltage is applied to scan electrodes SC1 to SCn, and sustain pulse voltage Vs (V) that is the first voltage is applied to sustain electrodes SU1 to SUn. Then, in the discharge cell in which the sustain discharge has occurred, the voltage between the sustain electrode SUi and the scan electrode SCi exceeds the discharge start voltage, so that the sustain discharge occurs again between the sustain electrode SUi and the scan electrode SCi, Negative wall voltage is accumulated on sustain electrode SUi, and positive wall voltage is accumulated on scan electrode SCi.

  Thereafter, similarly, by applying sustain pulses of the number corresponding to the luminance weight alternately to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn, the sustain discharge continues in the discharge cells that have caused the address discharge in the address period. Done. Thus, the maintenance operation in the maintenance period is completed.

  The operations in the initialization period, address period, and sustain period in the subsequent subfield are substantially the same as those in the first subfield, and thus description thereof is omitted.

  FIG. 5 shows an example of the overall configuration of a plasma display device incorporating the panel having the structure described above, and FIG. 6 shows an example of the arrangement of drive circuit blocks as viewed from the back side.

  In the figure, 21 is a chassis member as a holding plate that also serves as a heat sink made of metal such as aluminum. On the front side of the chassis member 21, a panel 11 is placed between the chassis member 21 and a heat dissipation sheet (see FIG. 5). (Not shown) is held by bonding with an adhesive or the like. Further, as shown in FIG. 6, a plurality of drive circuit blocks for driving the panel 11 are arranged on the rear side of the chassis member 21, thereby constituting a module.

  Here, the heat-dissipating sheet is for adhering and holding the panel 11 on the front side of the chassis member 21, efficiently transferring heat generated in the panel 11 to the chassis member 21, and performing heat dissipation. Is about 1 mm to 2 mm. As this heat radiating sheet, an insulating heat radiating sheet in which a synthetic resin material such as acrylic, urethane, silicon resin, or rubber contains a filler that enhances thermal conductivity, a graphite sheet, a metal sheet, or the like can be used. In addition, the heat radiation sheet itself has an adhesive force, and the panel 11 is bonded to the chassis member 21 only by the heat radiation sheet, or the heat radiation sheet has no adhesive force, and another double-sided adhesive tape is used. The structure etc. which adhere | attach can be used for the chassis member 21 can be used.

  In addition, flexible wiring boards 22 as display electrode wiring members connected to the electrode lead portions of the scan electrodes 3 and the sustain electrodes 4 are provided on both side edges of the panel 11, and the rear side passes through the outer periphery of the chassis member 21. And connected to the drive circuit block 23 of the scan electrode drive circuit 14 and the drive circuit block 24 of the sustain electrode drive circuit 15 via connectors.

  On the other hand, a plurality of flexible wiring boards 25 as data electrode wiring members connected to the electrode lead portions of the data electrodes 8 are provided on the lower and upper edges of the panel 11, and the flexible wiring boards 25 are connected to The plurality of data drivers 26 of the electrode drive circuit 13 are electrically connected to each other, routed to the back side through the outer periphery of the chassis member 21, and disposed at the lower and upper positions on the back side of the chassis member 21. The drive circuit block 27 of the data electrode drive circuit 13 is electrically connected.

  The control circuit block 28 displays image data on the basis of a video signal sent from an input signal circuit block 29 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. 11 is converted into an image data signal corresponding to the number of pixels 11 and supplied to the drive circuit block 27 of the data electrode drive circuit, and a discharge control timing signal is generated, and the drive circuit block 23 and the sustain electrode of the scan electrode drive circuit 14 are generated. This is supplied to the drive circuit block 24 of the drive circuit 15 and performs display drive control such as gradation control, and is arranged at substantially the center of the chassis member 21.

  The power supply block 30 supplies a voltage to each of the circuit blocks. Like the control circuit block 28, the power supply block 30 is disposed at a substantially central portion of the chassis member 21, and is commercialized through a connector to which a power supply cable (not shown) is attached. A power supply voltage is supplied. These drive circuit blocks 23, 24, 27, control circuit block 28, input signal circuit block 29, and power supply block 30 are fixed to the boss portion provided on the back side of the chassis member 21 with screws or the like.

  Further, a cooling fan 31 is disposed in the vicinity of the drive circuit blocks 23 and 24 while being held at an angle 32 so that the drive circuit blocks 23 and 24 are cooled by the wind sent from the cooling fan 31. It is configured. Further, the drive circuit block 27 of the data electrode drive circuit 13 disposed at the upper position is cooled at the upper position of the chassis member 21, and on the rear side of the chassis member 21, the entire apparatus is moved from the lower portion toward the upper portion. Three cooling fans 33 are arranged to cool the inside of the apparatus by causing an air flow.

  Further, reinforcing angles 34 and 35 are fixed to the chassis member 21 in the horizontal direction and the vertical direction, and the angle 34 arranged in the horizontal direction is a stand for holding the apparatus in an upright state. The pole 36 is fixed with screws or the like.

  The module having the above structure is housed in a housing having a front protective cover 37 disposed on the front side of the panel 11 and a metal back cover 38 disposed on the rear side of the chassis member 21. This completes the plasma display device. Here, the front protective cover 37 is attached to the front frame 39 made of resin or metal having an opening 39a from which the image display area on the front side of the panel 11 is exposed, and the opening 39a of the front frame 39, and And a protective plate 40 made of glass or the like provided with an unnecessary radiation suppressing film for suppressing unnecessary radiation of an optical filter or electromagnetic wave, and the protective plate 40 has a front frame around the periphery of the protective plate 40. It is attached to the front frame 39 by being sandwiched between the peripheral edge portion of the opening 39 a of 39 and a protective plate pressing metal fitting (not shown). Further, the back cover 38 is provided with a plurality of vent holes (not shown) for releasing heat generated by the module to the outside.

  In FIG. 5, reference numeral 41 denotes a screw for attaching the back cover 38 to the chassis member 21, and 42 denotes a gripping part attached to the back cover 38 with a screw or the like.

  Next, features of the video display device according to the present embodiment will be described in detail. FIG. 7 is a block diagram showing a schematic configuration of the characteristic part of the video display device 70 according to the embodiment of the present invention.

  The video display device 70 is configured as a video monitor having a video display function and an audio output function installed in a showroom or a public facility, and includes a microcomputer 71, a user input unit 72, a standby current detection unit 73, and a storage device ( A non-volatile memory) 74, an audio control unit 75, and a display control unit 76.

  The microcomputer 71 controls each part constituting the video display device 70.

  The user input unit 72 performs code analysis and processing determination of the remote controller, key analysis and processing determination of main body key operation, and transmits the input information to the microcomputer 71.

  The standby current detection unit 73 detects the standby current of the video display device 70 and transmits the result to the microcomputer 71.

  The storage device 74 is a nonvolatile memory that stores various states such as a theft prevention setting state and an operation restriction state, and updates and reads information stored in the microcomputer 71.

  The display control unit 76 controls and displays the output video from the video display device 70 according to instructions from the microcomputer 71, and outputs a warning when the operation is restricted.

  The sound control unit 75 controls sound output in the video display device 70 according to an instruction from the microcomputer 71, and outputs a warning when the operation is restricted.

  The time measuring unit 77 performs control to measure the time after the power is turned on and notify the microcomputer 71 of the time after the power is turned on in the operation limited state.

  The power control unit 78 performs power control in the video display device 70 according to an instruction from the microcomputer 71. If the operation is restricted, the power control unit 78 determines from the time notified from the time measurement unit 77 and turns off the power to the video display device 70. Control.

  In the above configuration, the user sets the anti-theft mode from the user input unit 72 by remote control input or body key operation. In response to the input, the microcomputer 71 stores the anti-theft mode setting in the storage device 74.

  Next, a theft prevention flow in the video display apparatus according to the embodiment of the present invention will be described with reference to FIG.

  First, in step 1 (ST1), information is acquired from the storage device 74 as to whether or not the current anti-theft mode is set. This information acquisition may be set to be performed when the user operates the video display device 70, for example, when the user input unit 72 is operated, which is highly likely to be touched. When the anti-theft mode is not set, the normal operation is performed without performing the operation restriction check process (ST2). If the anti-theft mode is set, the process proceeds to the next step ST3.

  In step 3 (ST3), the value read by the standby current detection unit 73 is determined, and it is determined from the value whether it is necessary to limit the operation. That is, if “standby current value (minimum value in normal operation) ≦ read-in current value”, it is determined that the device is in a normal use state. In this case, the operation restriction process is not performed and the operation restriction is not performed. The determination is terminated and the current state is continued (ST4). If “standby current value> read-in current value” or “standby current cannot be detected”, it is determined that the current state is not in a normal use state, and the process proceeds to step 5 (ST5). And memorize that there is an operation restriction.

  In the above, the situation below the standby current value is a state in which the main power supply is turned off or the connected power cable is disconnected, and the power supply is turned off once. In this state, when the power source which is one of the user input units 72 is turned on, the process starts from step 1 (ST1) and reaches step 5 (ST5).

  Therefore, hereinafter, the operation when the power of the video display apparatus in the operation restricted state and the power OFF state is turned on will be described with reference to the flow of FIG.

  First, in step 11 (ST11), the operation restriction state is read from the nonvolatile memory, and the process proceeds to the next step 12 (ST12).

  In ST12, it is determined whether or not there is an operation restriction from the operation restriction state read in ST11. When there is no operation restriction, the operation restriction determination process for the power-on operation is terminated. When the operation is restricted, the process proceeds to step 13 (ST13).

  In ST13, output of video and audio from the display control unit 76 and the audio control unit 75 is prohibited, and functions of the video display device 70 are limited. In this state, the process proceeds to step 14 (ST14).

  In ST14, it is determined whether or not a cancel command for canceling an operation restriction state based on a predetermined anti-theft setting is input from a user input unit, for example. If it has been input, the process proceeds to step 15 (ST15).

  In ST15, the operation restriction state is canceled, the setting is stored in the storage device, and the process is terminated. With this process, the next power-on operation can be started in a normal operation.

  If the release command is not input in ST14, the process proceeds to step 16 (ST16). In ST16, the time from when the power is turned on is read from the time measuring unit 77 and compared with the continuous activation permission time of the video display device 70 in a predetermined operation restriction state. If “starting elapsed time ≦ continuous starting permission time”, the process returns to ST14. If “starting elapsed time> continuous starting permission time”, the process proceeds to step 17 (ST17). In ST17, the power supply control unit is controlled from the microcomputer to turn off the apparatus. This may limit the number of times the release command is input, and may be configured to forcibly turn off the video display device if the operation restriction state cannot be canceled even if the release command is input more than a certain number of times. .

  Once it is determined by the combination of the flows described in FIG. 8 and FIG. 9 that there is a restricted state, the next time the power is turned on, the operation is started in the restricted state. The function as a display device does not work. On the other hand, when the authorized user has made the operation restricted state due to an erroneous operation or the like, the restricted state can be released by inputting a release command in advance.

  The user input means for setting the anti-theft setting is not limited to remote control input or main body key operation, but may be infrared communication or external input.

  As described above, in the conventional video display device operating in a showroom or the like, the video display device displayed in the absence of the administrator may be stolen, and the device can be normally used even after theft. However, in the video display apparatus according to the embodiment of the present invention described above, the flow of FIGS. 8 and 9 has occurred. In combination, the video display device itself has a mechanism that cannot be operated by anyone other than the original user, is stolen, and is operated in a normal state when someone other than the original user tries to operate it. As a result, it is possible to remove the willingness of theft and to have a deterrent effect against theft.

  That is, the user inputs the anti-theft setting in advance using the input means, stores it in the storage device, and in the anti-theft setting state, the presence / absence of current is determined using the standby current detection information, and it is determined that there is no current. In the case of a failure, the operation restricted state is stored in the storage device. Further, when a power ON operation is performed in a state where there is an operation restriction, use at a theft destination can be prohibited by restricting or prohibiting display of input video and audio output.

  As described above, the presence or absence of standby current is determined, and when it is detected that the standby current has been lost, it is detected as an abnormal state, it is determined that it has been stolen, and either or all of the display of input video and audio output are restricted. Alternatively, by prohibiting it and making it impossible to use it normally, it is possible to eliminate the value as a video display device, prevent resale, and suppress theft.

  Since the determination criterion for the anti-theft state is the detection of the presence or absence of standby current, it is possible to save time and effort for connecting another signal line and the like. Also, when the installed video device is stolen, the power is always turned off, so it is absolutely impossible to avoid the anti-theft state, so the anti-theft function is highly reliable. .

  In other words, according to the video display device according to the embodiment of the present invention, the user can determine the non-installation state in which the standby current does not normally disappear by setting the anti-theft mode in advance, and the power is turned off once. In the non-installation state, an abnormality can be detected when a power operation is performed. When an abnormal state is detected, it is determined that the device has been stolen, and any or all of the operations for displaying the input video and outputting the sound are restricted or prohibited, so that it cannot be used normally. It has functions that can eliminate value, prevent resale, and prevent theft. Therefore, the present invention can also be applied to uses such as video display devices such as television devices and monitors.

  As described above, the present invention is useful in providing a video display device, particularly a plasma display device having a large screen, a thin and light weight, and the like.

The perspective view which shows the principal part of the panel used for the plasma display apparatus by one embodiment of this invention. Electrode arrangement of the panel Circuit block diagram of the plasma display device Waveform diagram showing drive voltage waveform applied to each electrode of panel Exploded perspective view showing the entire configuration of the plasma display device The top view which shows an example of arrangement | positioning which looked at the same plasma display apparatus from the back side The block diagram which shows schematic structure of the video display apparatus by one embodiment of this invention The flowchart for demonstrating the restriction | limiting process operation | movement in the video display apparatus by one embodiment of this invention. The flowchart for demonstrating the restriction | limiting process operation | movement in the video display apparatus by one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Plasma display panel 21 Chassis member 22, 25 Flexible wiring board 23, 24, 27 Drive circuit block 26 Data driver 43 Base board 44, 45 Metal plate 45a Protrusion part 70 Video display apparatus 71 Microcomputer 72 User input part 73 Standby current detection part 74 Storage Device 75 Audio Control Unit 76 Display Control Unit 77 Time Measurement Unit 78 Power Supply Control Unit

Claims (2)

Video configured to detect standby current of the video display device and limit or prohibit output of input video and / or audio when the video display device is turned on after the standby current is not detected Display device. 2. The video display device according to claim 1, wherein when the operation is performed so as to restrict or prohibit the output of input video and / or audio, the state can be canceled by a predetermined operation.

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