WO2004086130A1 - 表示装置 - Google Patents
表示装置 Download PDFInfo
- Publication number
- WO2004086130A1 WO2004086130A1 PCT/JP2004/003892 JP2004003892W WO2004086130A1 WO 2004086130 A1 WO2004086130 A1 WO 2004086130A1 JP 2004003892 W JP2004003892 W JP 2004003892W WO 2004086130 A1 WO2004086130 A1 WO 2004086130A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- unit
- opening
- display device
- main body
- Prior art date
Links
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
- G02F1/133385—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell with cooling means, e.g. fans
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/36—Airflow channels, e.g. constructional arrangements facilitating the flow of air
Definitions
- the present invention relates to a display device having a liquid crystal panel and the like, and more particularly to a display device having a heat radiating mechanism for a built-in power supply. In particular, it relates to a display device having a hard disk drive. In particular, the present invention relates to a display device in which a cable set including a power plug or the like can be replaced according to a destination.
- the present invention relates to a display device provided with a protection circuit for protecting the device from a load on a liquid crystal panel or the like or an abnormality of a control unit such as a CPU (Central Processing Unit).
- a control unit such as a CPU (Central Processing Unit).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-287709
- Patent Document 1 a display device having a power supply unit, an image driving unit, a signal processing unit, and the like is disclosed.
- the power output from the power supply unit increases.
- the display device described in Patent Document 1 has no storage means, and thus has a problem that a large amount of data cannot be read or written. Even if a hard disk drive as a storage means is installed, it is necessary to remove approximately 30 bolts fixing the rear plate of the main unit in order to remove the hard disk drive by simply installing it. The problem is that the work is troublesome. In addition, if a dedicated mounting base is installed, there is a problem that the cost is high. (The problem of the inability to read and write this large amount of data, the troublesome work, and the high cost are collectively described below.) "The second problem").
- Patent Document 2 Japanese Patent Application Laid-Open No. H6-151023
- a nameplate indicating the commercial power supply voltage at the destination is attached to the surface of the casing. After inserting the male connector of the cable set (consisting of the power plug, cable and male connector) into the female connector attached to the main unit, cover the main unit with the casing, and fasten with 10 or more small screws. are doing.
- Patent Document 3 j Japanese Patent Application Laid-Open No. H10-234130
- the device described in Patent Document 3 does not have a protection circuit when the load or the temperature of the control unit becomes abnormally high, and the control unit including a CPU (Central Processing Unit) operates abnormally. There is a problem that there is no protection means in the event of a runaway (for example, runaway). Further, in the device described in Patent Document 3 above, if the power supply to the load is stopped in the event of an abnormality, the device does not automatically return. There is a problem (these problems in Patent Document 3 are collectively referred to as “fourth problem” hereinafter). Disclosure of the invention
- an object of the present invention is to provide a display device that can improve reliability and the like. Target.
- the present invention has as its first object to provide a display device having a power supply unit with high reliability and a suppressed temperature rise value in order to solve the first problem. I do.
- a display device including a casing having a first lower ventilation hole and a first upper ventilation hole, the casing being disposed on a front surface side in the casing.
- a first cooling fan disposed on a rear surface side in the casing, and a first circuit board constituting the first power supply unit is disposed obliquely with respect to a first side surface of the casing.
- the first circuit board is arranged to be inclined with respect to the first side surface of the casing.
- the distance over which the air sucked by the first cooling fan passes through the first circuit board is smaller than in the case where they are not tilted. Therefore, the temperature rise value of the electrical components on the first circuit board is small.
- a first partition plate adjacent to the first cooling fan and the first power supply unit is provided; a first opening is provided in the first partition plate; The air sucked by the cooling fan enters through the first lower ventilation hole, passes through the first opening, the vicinity of the first power supply unit, and the first cooling fan, and is discharged from the first upper ventilation hole.
- the first partition plate by providing the first partition plate, the first partition plate and the casing constitute a closed first space. Then, the suction air from the first cooling fan enters through the first lower ventilation hole and passes through the first opening and the vicinity of the first power supply unit. As a result, the cooling effect of the suction air on the first power supply unit increases.
- a second upper ventilation hole is provided in the casing, and a second power supply unit that is disposed on a rear surface side in the casing and supplies power to a driving unit of the liquid crystal display unit.
- a second cooling fan is provided on the rear surface side in the casing so as to be located near the second upper ventilation hole, and a second cooling fan constituting the second power supply unit is provided.
- the road board is disposed obliquely with respect to the second side surface of the casing facing the first side surface.
- the burden on each power supply unit is reduced. As a result, the reliability of each power supply unit increases.
- a second partition plate adjacent to the second cooling fan and the second power supply unit is provided; a second opening is provided in the second partition plate; The first suction air from the cooling fan enters through the first lower ventilation hole, passes through the second opening, the vicinity of the second power supply unit, and the second cooling fan, and is discharged from the second upper ventilation hole.
- the second partition plate By providing the second partition plate in this way, a closed second space is formed by the second partition plate and the casing. Then, the suction air from the second cooling fan enters through the second lower ventilation hole and passes through the second opening and the vicinity of the second power supply unit. As a result, the cooling effect of the suction air on the second power supply unit is enhanced.
- a second lower ventilation hole is provided in the casing so as to be located below the second power supply unit, and the second intake air by the second cooling fan is It was configured to enter from the second lower air hole, pass through the vicinity of the second power supply unit and the second cooling fan, and be discharged from the second upper air hole.
- the second power supply unit is cooled by both the first suction air and the second suction air, so that the cooling effect is large. As a result, the temperature rise value of the electrical components that make up the second power supply unit becomes smaller.
- the present invention (second present invention) aims at solving the second problem by providing a display device which can read and write a large amount of data, can easily attach and detach a storage device, and is inexpensive. This is the second purpose.
- a substantially box-shaped main body having a first opening formed on a rear surface side, and a liquid crystal disposed on a front side of the main body.
- a display unit a substrate assembly disposed in the main body and outputting an image signal to the liquid crystal display unit, a shield plate covering the substrate assembly, and a hard disk drive fixed to the shield plate and reading and writing data. .
- Hard disk The drive was detachably provided through the first opening.
- a hard disk drive inside the main body, a large amount of data can be read and written, a large amount of image information can be captured via, for example, the Internet, and a large amount of image information can be displayed.
- removing the hard disk drive it may be performed through a small window (first opening) formed in the main body, and the attaching and detaching work is easy.
- the hard disk drive since the hard disk drive is fixed on the shield plate, there is no need to provide a new mounting base, and the cost can be reduced.
- a cover that covers the first opening is provided, and the cover is detachably attached to the main body.
- a circuit board constituting a board assembly is provided with a reinforcing plate provided in contact with an inner surface of the body facing the opposite side, and a mounting plate supported by the reinforcing plate. Supported by the mounting plate.
- the strength plate improves the strength of the main body and supports the circuit board via the mounting plate, so that the circuit board is securely fixed. As a result, the reliability of quality is improved without rattling of the electrical components on the circuit board.
- a second opening is provided in the shield plate so as to be located below the hard disk drive, and the circuit board is arranged so as to be located below the second opening.
- the memory was fixed to the memory, and the memory was provided detachably.
- the work of attaching and detaching the memory becomes easy. Further, the second opening formed in the shield plate is closed by the hard disk drive, so that the shielding property can be maintained.
- a third object of the present invention is to provide a display device which can be easily replaced when the destination is changed in order to solve the third problem.
- the display device includes a box-shaped main body having a first opening, a liquid crystal panel disposed in the main body, and a front side.
- the first fixing plate for fixing the first connector adapted to the destination is detachably fixed, so that even when the destination is changed, the work of replacing the first connector becomes easy.
- a power switch electrically connected to the first connector is provided, and a rear surface side of the power switch protrudes into the main body through the first opening.
- the first fixing plate fixes the power switch, and the first fixing plate is detachably fixed to the main body so that the front side of the power switch is exposed.
- a first standing wall portion is formed in the main body, the first opening is formed in the first standing wall portion, and the first fixing plate includes a first horizontal portion.
- a first vertical portion, a claw, a second opening and a third opening are formed, the first connector is inserted and fixed in the second opening, and the power switch is inserted and fixed in the third opening.
- the first horizontal portion is fixed to a rear portion of the main body by a first fastening component, and the nail is fixed by being sandwiched between the first standing wall portions located near the first opening. According to this structure, the engagement or release of the nail and the first standing wall portion can be easily performed by sliding the nail. .
- a fourth opening is formed in the main body, a second conductive cylinder of a predetermined shape is formed on the front side, and a fourth conductive cylinder is electrically connected to the first connector.
- the second connector and the rear surface side of the second connector are connected to the fourth connector through the fourth opening.
- a second standing wall portion is formed in the main body, the fourth opening is formed in the second standing wall portion, and the second fixing plate includes a second horizontal portion and a second horizontal portion.
- a vertical portion, a bent portion, and a fifth opening are formed, the second connector is inserted and fixed in the fifth opening, and the second horizontal portion is fixed to a rear portion of the main body by the second fastening part.
- the bent portion abuts and is fixed to an inner surface of the second standing wall portion located near the fourth opening.
- the present invention is an apparatus for solving the above-mentioned fourth problem, which detects a load voltage, a load or a temperature of a control unit, and an abnormal operation of the control unit to detect a power supply.
- the fourth object is to provide a display device for stopping the operation and then automatically returning the operation after that.
- a load unit having at least a display unit, a first power supply unit for supplying power to the load unit, and a first power supply
- a control unit that is supplied with power by the unit and controls the load unit; a monitoring unit that monitors the load unit and the control unit; and a return unit that controls the first power supply unit.
- the return unit stops power supply to the load unit and the control unit by the first power supply unit.
- the power supply by the first power supply unit is stopped, so that not only the load unit but also the control unit can be protected.
- the monitoring unit may determine that at least one of the temperature of the load unit or the control unit, the voltage of the load unit, and the operation of the control unit is abnormal.
- the return unit is connected to the load unit by the first power supply unit. And stopping the power supply to the control unit.
- the load section can be protected and the runaway can be stopped.
- the return unit restarts power supply to the load unit and the control unit by the first power supply unit when a predetermined time has elapsed after the power supply was stopped.
- the return unit automatically restarts the power supply, eliminating the trouble of manually restarting as in the past.
- the power supply is stopped and restarted after a predetermined time, so that the control unit or the like normally operates normally.
- a second power supply unit having an input side connected to a power supply plug is provided, an input side of the first power supply unit is connected to the power supply plug, and an output of the second power supply unit is provided.
- the side may be connected to the return section.
- the return unit can perform the automatic return control operation. it can.
- FIG. 1 is a block diagram showing an electrical configuration of a display device according to a first embodiment of the present invention.
- FIG. 2 is a drawing of the display device shown in FIG. 1 as viewed from behind.
- FIG. 3 is a sectional view taken along line A 1 —A 1 of FIG.
- FIG. 4 is a block diagram showing an electrical configuration of a display device according to a second embodiment of the present invention.
- FIG. 5 is an exploded perspective view of the display device in FIG.
- FIG. 6 is a perspective view of the display device in FIG. 4 when a rear plate is removed.
- FIG. 7 is a sectional view taken along line A2-A2 in FIG.
- FIG. 8 is a block diagram showing an electrical configuration of a display device according to a third embodiment of the present invention.
- FIG. 9 is a view of the display device in FIG. 8 as viewed from the back.
- FIG. 10 is a sectional view taken along line A3-A3 in FIG.
- FIG. 11A is a plan view of a first fixing plate in FIG. 9.
- FIG. 11B is a front view of the first fixing plate in FIG. 9.
- FIG. 11C is a side view of the first fixing plate in FIG.
- FIG. 10 is a sectional view taken along line A4-A4 in FIG.
- FIG. 13A is a side view of the second fixing plate in FIG. 9.
- FIG. 13B is a plan view of a second fixing plate in FIG. 9.
- FIG. 13C is a front view of the second fixing plate in FIG. 9.
- FIG. 14 is a block diagram showing an electrical configuration of a display device according to a fourth embodiment of the present invention.
- FIG. 15 is an electric circuit diagram of the monitoring unit in FIG.
- FIG. 16 is an electric circuit diagram of a return section in FIG.
- FIG. 17 is a diagram showing voltage waveforms at various parts of the display device in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing an electrical configuration of the display device 1 according to the first embodiment.
- terminal 2 is a component that receives an external signal.
- Terminal 2 It consists of an SB connector, an RJ45 connector, an RS232C connector, and the like.
- Terminal 2 is connected to one end of a LAN (Local Area Network) line (not shown), for example.
- LAN Local Area Network
- the other end of the LAN line is connected to the Internet via a server (not shown).
- the signal processing unit 3 includes, for example, a CPU (Central Processing Unit) and a communication interface. One face, an input unit, a signal conversion unit, a RAM (Random Access Memory), a storage unit (none of which is shown), and the like.
- the CPU requests predetermined image information (for example, advertisement information) from a provider server (not shown) connected to the Internet.
- the image information is input to the signal processing unit 3 via the Internet, a server, a LAN line, and a terminal 2.
- the signal processing unit 3 converts the input image information into image data (digital values of R, G, and B) according to the image size (for example, 29 inches) of the liquid crystal panel 4 (described later), and transmits the image data to the transmitter 5.
- the above data is output.
- the transmitter 5 converts the input image data into a low-level differential transmission signal LVDS (Low Voltage Differential Signal), and outputs the signal LVDS to the driving unit 6.
- LVDS Low Voltage Differential Signal
- the DC-DC converter 7 is a component that, when a DC voltage (for example, 14 V) is input, outputs predetermined DC voltages (for example, 12 and 5 ⁇ and 3.3 V). In this way, the DC-DC converter 7 outputs a predetermined voltage to the signal processing unit 3, the transmitter 5, and the driving unit 6, respectively.
- a DC voltage for example, 14 V
- predetermined DC voltages for example, 12 and 5 ⁇ and 3.3 V
- the terminal 2, the signal processing unit 3, the transmitter 5, and the DC-DC converter 7 are fixed to each wiring pattern provided on the main circuit board 8 via solder or the like.
- the main board 9 is composed of these terminals 2, the signal processing unit 3, the transmitter 5, the DC-DC converter 7, the main circuit board 8, and the like.
- the liquid crystal panel 4 is made of, for example, a liquid crystal sealed in two glass plates.
- a plurality of source electrodes and a plurality of gate electrodes are formed in rows and columns on the surface of the lower glass plate, and each TFT (Thin Film Transistor) is formed for each pixel.
- TFT Thin Film Transistor
- the drive unit 6 includes, for example, a source driver and a gate driver.
- the source driver is connected to the plurality of source electrodes.
- the gate driver is connected to the plurality of gate electrodes. As described above, the driving section 6 drives each source electrode and each gate electrode provided on the liquid crystal panel 4.
- the backlight 10 illuminates the liquid crystal panel 4.
- the inverter 11 drives the backlight 10.
- the liquid crystal display section 12 is constituted by the backlight 10 and the inverter 11 and the like.
- a commercial power supply (not shown) is supplied to the input side of the plug 13, and the output side of the plug 13 is connected to the first power supply section 15 and the second power supply section 16 via the connector board 14. It has been.
- Each of the first power supply unit 15 and the second power supply unit 16 includes a transformer, a rectifier circuit, and the like, and supplies a DC voltage having a predetermined voltage.
- the first power supply unit 15 supplies a predetermined power to the pack light 10 of the liquid crystal display unit 12 via the inverter 11.
- the second power supply section 16 supplies a predetermined power to the drive section 6 of the liquid crystal display section 12 via the DC-DC converter 7.
- the electrical configuration of the display device 1 is made up of the above components.
- FIG. 2 is a rear view of the display device 1 when a rear plate (a rear plate 35 described later) is partially removed
- FIG. 3 is a cross-sectional view taken along A1-A1 of FIG.
- the upper, lower, right, and left sides in the figures will be described as upper, lower, right, and left, respectively.
- the same parts as those in FIG. 1 may be denoted by the same reference numerals and description thereof may be omitted.
- the frame 17 is made of, for example, a stainless steel plate and formed in a substantially square frame shape. A bent portion is formed at a predetermined position on the rear surface side B1.
- the upper part of the first partition plate 18 contacts the inner surface of the upper plate 20 forming the frame 17, and the lower part of the first partition plate 18 contacts the inner surface of the lower plate 21 forming the frame 17.
- the first partition plate 18 is arranged and fixed so as to be in contact with each other.
- the second partition plate 19 is arranged such that the upper portion of the second partition plate 19 contacts the inner surface of the upper plate 20 and the lower portion of the second partition plate 19 contacts the inner surface of the lower plate 21. , Has been fixed.
- the first partition plate 18 has a first opening 22 formed at an appropriate position on the rear side B1 (see FIG. 3).
- the first partition plate 18 is made of, for example, an extruded material of aluminum, and has a substantially convex cross section.
- the second partition plate 19 has a second opening (not shown) formed at an appropriate position on the rear side B1.
- the second partition plate 19 is made of, for example, an extruded material of aluminum, and has a substantially convex cross-sectional shape.
- the first cooling fan 23 includes, for example, a fan, a fan casing, a motor, and the like.
- the left side of the fan casing constituting the first cooling fan 23 is placed on the right side of the first partition plate 18 and fixed with small screws.
- the right side of the fan casing is placed on the bent portion of the frame 17 and fixed with small screws.
- the mounting plate 24 has, for example, a substantially U-shaped cross section, and has bent portions formed at the left end and the right end, respectively.
- the left bent portion formed on the mounting plate 24 is placed on the right side of the first partition plate 18 and fixed with small screws.
- the right bent portion formed on the mounting plate 24 is placed on the bent portion of the frame 17 and is fixed with small screws.
- the first power supply unit 15 includes, for example, a first circuit board 25 and electric components 26 a, 26 b, 26 c, 26 d, 26 e (transformers, resistors, capacitors, etc.) fixed thereon. And transistors).
- the first circuit board 25 is fixed to the mounting plate 24 via spacers 27a and 27b.
- the mounting plate 28 has, for example, a substantially U-shaped cross section, and has a bent portion formed on each of the left and right sides thereof. It is placed on the right side and fixed with machine screws. The right bent portion of the mounting plate 28 is placed on the left side of the first partition plate 18 and is fixed with small screws.
- the main board 9 is fixed to the mounting plate 28 via a spacer (not shown).
- the second cooling fan 29 includes, for example, a fan, a fan casing, a motor, and the like.
- the left side of the fan casing of the second cooling fan 29 is placed on the bent portion of the frame 17 and fixed with small screws.
- the right side of the fan casing is placed on the left side of the second partition plate 19 and fixed with small screws.
- the mounting plate 30 has, for example, a substantially U-shaped cross section, and has bent portions formed on the left and right sides thereof.
- the left bent portion of the mounting plate 30 is placed on the bent portion of the frame 17 and fixed with small screws.
- the right bent portion of the mounting plate 30 is placed on the left side of the second partition plate 19 and is fixed with small screws.
- the second power supply section 16 includes, for example, a second circuit board 31 and electric components fixed thereon. It is composed of 32a, 32b, 32c, 32d, 32e (including transformers, resistors, capacitors, transistors, etc.).
- the second circuit board 31 is fixed to the mounting plate 30 via a spacer (not shown).
- the front plate 33 is made of, for example, a metal plate or the like, and is formed in a box shape.
- An opening 34 is formed in the front side C1 of the front plate 33.
- a recess is formed at an appropriate position on the side surface of the front plate 33, and the recess abuts on the frame 17, and the front plate 33 is fixed to the frame 17 with small screws.
- the rear plate 35 is made of, for example, a metal plate or the like, and has a bent portion formed on the front side C 1. The bent portion is inscribed in the front plate 33. The rear plate 35 is placed on the bent portion of the frame 17, on the first partition plate 18, and on the second partition plate 19, and each is fixed with a small screw. I have.
- a first lower air hole 36 is formed substantially at the center of the lower portion of the rear plate 35, and a second lower air hole 37 is formed on the lower left side.
- a first upper air hole 38 is formed on the upper right side of the rear plate 35, and a second upper air hole 39 is formed on the upper left side.
- a casing 40 is constituted by the frame 17, the front plate 33 and the rear plate 35.
- the liquid crystal display unit 12 includes, for example, a 29-inch liquid crystal panel 4, a driving unit 6, a backlight 10, an inverter 11, and the like, and has an approximately rectangular parallelepiped outer shape.
- the liquid crystal display section 12 is fixed to the inner side of the frame 17 with, for example, bolts (not shown).
- the front side C 1 of the liquid crystal display section 12 is in contact with the inner surface of the front plate 33 via the packing 41.
- the inverter 11 may be arranged at a position away from the liquid crystal display unit 12.
- the mechanical configuration of the display device 1 is made up of the above components. The characteristic configuration of the display device 1 described above will be described below.
- a first lower air hole 36 and a first upper air hole 38 are formed in the casing 40.
- the liquid crystal display section 12 is disposed on the front side C1 in the casing 40.
- the first power supply section 15 is disposed on the rear side B 1 in the casing 40, and supplies power to the backlight 10 of the liquid crystal display section 12 via the impeller 11.
- the first cooling fan 23 is disposed on the rear surface side B1 of the casing 40 so as to be located near the first upper ventilation hole 38.
- the first circuit board 25 composing the first power supply section 15 is disposed to be inclined (that is, to be oblique, not parallel, to the first side surface 42 of the casing 40).
- the first partition plate 18 is arranged adjacent to the first cooling fan 23 and the first power supply unit 15.
- the first partition plate 18 has a first opening 22 formed therein.
- the intake air D from the first cooling fan 23 enters through the first lower ventilation hole 36, passes through the first opening 22, near the first power supply unit 15, and after passing through the first cooling fan 23.
- the first upper ventilation hole 38 is configured to be exhausted.
- the second power supply section 16 is disposed on the rear side B 1 in the casing 40 and supplies power to the drive section 6 of the liquid crystal display section 12.
- the second cooling fan 29 is arranged on the rear surface side B1 in the casing 40, and is arranged near the second upper ventilation hole 39.
- the second circuit board 31 constituting the second power supply section 16 is inclined (i.e., not parallel, but obliquely) with respect to the second side 43 of the casing 40 facing the first side 42. To).
- the second partition plate 19 is disposed adjacent to the second cooling fan 29 and the second power supply unit 16. A second opening is formed in the second partition plate 19.
- the first suction air E from the second cooling fan 29 enters through the first lower ventilation hole 36, passes through the second opening, near the second power supply unit 16, and after passing through the second cooling fan 29.
- the second upper ventilation hole 39 is configured to be discharged.
- a second lower air hole 37 is formed in the casing 40 so as to be located below the second power supply section 16.
- the second suction air F from the second cooling fan 29 enters the second lower air hole 37 at a distance, passes through the vicinity of the second power supply section 16 and the second cooling fan 29, and then passes through the second upper air port 37. It is configured to be exhausted from the vent hole 39.
- the display device 1 is configured by the above components.
- the user inserts the plug 13 into a power outlet (not shown), presses the power switch (not shown), and inputs the specified input to the input section (keyboard, mouse, etc.) constituting the signal processing section 3. Shall be performed.
- image information is input from the provider server to the signal processing unit 3 via the Internet, the server, the LAN line, and the terminal 2.
- the image information is converted into image data by the signal processing unit 3 and input to the transmitter 5.
- the image data is converted into an LVDS signal by the transmitter 5 and input to the drive unit 6. Then, the liquid crystal panel 4 performs display according to the LVDS signal. Further, voltage is also supplied to the first power supply unit 15, the second power supply unit 16, the first cooling fan 23, and the second cooling fan 29.
- the suction air D from the first cooling fan 23 enters through the first lower ventilation hole 36, and the first opening 22 and the vicinity of the first power supply unit 15 and the first cooling fan 23 Pass through. Thereafter, the intake air D is discharged from the first upper ventilation hole 38.
- the first cooling passes through the arrow of the solid line from the first lower air hole 36 to the first power supply unit 15 through the first opening 22 and the vicinity of the first power supply unit 15.
- the solid arrow heading to fan 23 indicates the flow of intake air D.
- the temperature rise values of the electric components 26a to 26e on the first circuit board 25 are inclined. It is suppressed more than the case without.
- the first space 44 closed by the casing 40 and the first partition plate 18 has a substantially rectangular shape when viewed from a plane (when viewed from the direction perpendicular to the plane of FIG. 2). See).
- the first circuit board 25 is also substantially rectangular when viewed from above.
- the first circuit board 25 has a longer side in the direction in which the electronic components 26a, 26b, 26c, 26d are arranged than the other sides of the first circuit board 25. .
- the first example corresponds to a case where the longitudinal direction of the first side surface 42 (the vertical direction in FIG. 2) and the longitudinal direction of the first circuit board 25 are parallel.
- the temperature of the intake air D gradually increases as it goes upward due to the electrical components 26a, 26b, 26c, 26e on the first circuit board 25.
- the temperature rise value of the electrical component 26d fixed on the first circuit board 25 and located above the electronic component 26a and the like becomes higher.
- the first circuit board 25 is tilted by 90 degrees with respect to the first side surface 42 (that is, the first circuit board 25 is arranged laterally) as a second example.
- the second example corresponds to a case where the longitudinal direction of the first side surface 42 (the vertical direction in FIG. 2) and the longitudinal direction of the first circuit board 25 are perpendicular.
- the suction air D has the shortest distance through the first circuit board 25 (shorter than in the configuration of FIG. 2 and the first example).
- the suction air D passing through the electric component 26a is heated only by the electric component 26a, so that the temperature rise value is small. Also, since the electric component 26 e located above the electric component 26 a contacts the above-mentioned intake air D, the temperature rise of the electric component 26 e is small.
- the present inventor has determined that as the first circuit board 25 is inclined with respect to the first side surface 42, the temperature rise values of the electrical components 26a to 26e become smaller. However, since the size of the first space 44 is limited, the first circuit board 25 cannot be placed horizontally as in the second example.
- the first circuit board 25 is disposed as inclined as possible (that is, obliquely with respect to the first side surface 42) within the limit of the size of the first space 44. Is good.
- the electric components 32a to 32e on the second circuit board 31 also start to increase in temperature.
- the first suction air E from the second cooling fan 29 enters through the first lower air hole 36, passes through the second opening, the vicinity of the second power supply unit 16, and the second cooling fan 29. . Thereafter, the first intake air E is discharged from the second upper ventilation hole 39.
- the second suction air F from the second cooling fan 29 is supplied from the second lower ventilation hole 37. And pass through the vicinity of the second power supply section 16 and the second cooling fan 29. Thereafter, the second intake air F is exhausted from the second upper ventilation hole 39.
- the solid arrow from the first lower air hole 36 to the second power supply 16 via the second opening indicates the flow of the first intake air E
- the second lower air hole indicates the flow of the second intake air F
- solid arrows pointing toward the second cooling fan 29 through the vicinity of the second power supply section 16 indicate the flows of the first suction air E and the second suction air F.
- the cooling effect is large.
- the temperature rise values of the electric components 32 a to 32 e constituting the second power supply section 16 are small.
- the second circuit board 31 is also arranged to be inclined toward the second side surface 43 of the casing 40.
- the side of the second circuit board 31 in the direction in which the electronic components 32a, 32b, 32c, 32d are arranged is longer than the lengths of the other sides thereof.
- distance is therefore small c the first suction air E and the second suction air F passes through the second circuit board 3 1, placed without tilting
- the temperature rise values of the electric components 32 a to 32 e on the second circuit board 31 are further reduced as compared with the case where the above-mentioned operation is performed.
- FIG. 4 is a block diagram showing an electrical configuration of the display device 101 according to the second embodiment.
- a terminal 102 is a component that receives an external signal, and includes, for example, a USB connector, an RJ45 connector, an RS232C connector, and the like.
- the terminal 102 is connected, for example, to one end of a LAN (Local Area Network) line (not shown), and the other end of the LAN line is connected to the Internet via a server (not shown). I have.
- LAN Local Area Network
- the signal processing unit 103 includes, for example, a CPU (Central Processing Unit), a communication interface, an input unit, a signal conversion unit, and the like. The specified input is not Then, the CPU requests predetermined image information (for example, advertisement information) from a provider server (not shown) connected to the Internet.
- predetermined image information for example, advertisement information
- the image information is input to the signal processing unit 103 via the Internet, the server, the LAN line, and the terminal 102.
- the signal processing unit 103 converts the input image information into image data (R, G, B digital values) according to the image size (for example, 29 inches) of a liquid crystal panel (described later), and transmits the image data to the transmitter 10.
- the above data is output for 5.
- the transmitter 105 converts the input image data into an image signal, that is, a low-level differential transmission signal LVDS (Low Voltage Differential Signal), and sends the above image to the drive unit 106. Output a signal.
- LVDS Low Voltage Differential Signal
- the DC-DC converter 107 is a component that outputs a predetermined DC voltage (eg, 12 V, 5 V, and 3.3 V) when a DC voltage (eg, 14 V) is input. In this manner, the DC-DC converter 107 outputs a predetermined voltage to the signal processing unit 103, the transmitter 105, and the driving unit 106, respectively.
- RAM (Random Access Memory) 103 a is connected to the signal processing unit 103.
- the terminal 102, the signal processing unit 103, the transmitter 105, the DC-DC converter 107, and the RAM 103a are provided on the circuit board 108. It is fixed on the wiring pattern via solder or the like. Board assembly using these terminals 102, signal processing section 103, transmitter 105, DC-DC converter 107, RAM 103a, circuit board 108, etc. Article 109 is composed.
- the liquid crystal panel 104 is made of, for example, a liquid crystal sealed in two glass plates.
- a plurality of source electrodes and a plurality of gate electrodes are formed in rows and columns on the surface of the lower glass plate, and each TFT (Thin Film Transistor) is formed for each pixel.
- the drive unit 106 includes, for example, a saw driver, a gate driver, and the like.
- the source driver is connected to the plurality of source electrodes.
- the gate driver is connected to the plurality of gate electrodes. As described above, the driving section 106 drives each source electrode and each gate electrode provided in the liquid crystal panel 104.
- the backlight 110 illuminates the liquid crystal panel 104.
- the inverter 111 drives the pack light 110.
- the liquid crystal display unit 112 is configured by the driving unit 106, the knock light 110, the inverter 111, and the like.
- the board assembly 109 outputs the image signal LVDS to the liquid crystal display unit 112.
- a commercial power supply (not shown) is supplied to the input side of the plug 113, and the output side of the plug 113 is connected to the first power supply unit 115 via the connector board 114 and the second power supply.
- Each of the first power supply section 115 and the second power supply section 116 includes a transformer, a rectifier circuit, or the like, and supplies a DC voltage having a predetermined voltage. That is, the first power supply section 115 supplies a predetermined power to the backlight 110 of the liquid crystal display section 112 via the inverter 111.
- the second power supply section 116 supplies a predetermined power to the drive section 106 of the liquid crystal display section 112 via the DC-DC converter 107.
- the hard disk drive (HDD) 117 can read and write data, and has a larger storage capacity than the RAM 103 a.
- the hard disk drive 117 is connected to the signal processing unit 103, and data and the like are transmitted to and received from the signal processing unit 103.
- the memory 118 (for example, a flash memory) is connected to the signal processing unit 103, and data and the like are transmitted to and received from the signal processing unit 103.
- the memory 118 is fixed on the circuit board 108 as necessary.
- the electrical configuration of the display device 101 is made up of the above components.
- FIG. 5 is an exploded perspective view of the display device 101
- FIG. 6 is a perspective view of the display device 101 when a rear plate (a rear plate 133 described later) is removed
- FIG. FIG. 2 is a sectional view taken along line A-2.
- FIG. 6, and FIG. 7, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.
- the frame 119 is made of, for example, a stainless steel plate, is formed in a substantially frame shape when viewed from a plane, and is formed in a shape in which the front side and the back side are open. Multiple bent parts are formed in place on the rear side C2 of the frame 1 19 I have.
- the reinforcing plates 120, 122, 122 are all made of extruded aluminum, for example, and are formed in a substantially rectangular parallelepiped shape when viewed from a plane.
- each of the force plates 12 0, 12 1, and 12 2 is in contact with the inner surface of the frame 1 19.
- the other end face of each of the force plates 1 20, 1 2 1, 1 2 2 is also in contact with the inner surface of the frame 1 19.
- the strength plates 12 0, 12 1, 12 2 abut against the opposing inner surfaces of the frame 1 19 and are fixed by bolts or the like.
- the cooling fan 123 includes, for example, a fan, a fan casing, a motor, and the like.
- the left end of the cooling fan 123 is fixed to the strength plate 120 by bolts.
- the cooling fan 124 includes, for example, a fan, a fan casing, a motor, and the like.
- the right end of the cooling fan 124 is fixed to the strong plate 121 by bolts.
- the mounting plate 1 25 is made of, for example, a metal plate, and the left end is fixed to the reinforcing plate 120 through the fixing plate 126, and the right end is fixed to the reinforcing plate 120 through the fixing plate 127. It is fixed to. In this manner, the mounting plate 125 is supported by the strength plates 120, 121.
- the second power supply section 1 16 is attached to the fixing plate 128.
- the first power supply section 1 15 is attached to the fixing plate 1 29.
- the liquid crystal display unit 112 includes, for example, a 29-inch liquid crystal panel 104, a plurality of backlights 110, and the like, and has a substantially rectangular parallelepiped outer shape.
- the liquid crystal display unit 112 is fixed to the inner surface of the frame 119 by bolts or the like.
- a transparent plate 130 is disposed on the front side B2 of the liquid crystal display unit 112 via a packing.
- the casing 131 for example, is made of a metal plate or the like, and is formed in a box shape with a bottom.
- An opening 1 32 is formed in the front side B 2 of the casing 13 1.
- the transparent plate 130 and the liquid crystal display unit 112 are configured so as to be visible to the user from the front through the opening 132.
- a hole is formed in the side of the casing 13 1, and the bolt penetrates this hole, It is provided in the arm 1 19 and is fixed in the threaded hole.
- the casing 13 1 is provided so as to cover the frame 1 19 and the liquid crystal display unit 112.
- the rear plate 13 3 is made of, for example, a metal plate or the like, and is formed so as to cover the rear side C 2 of the frame 119.
- Bolts (not shown) pass through holes formed in the rear plate 133 and are fixed to holes located at the bent portions of the frame 119.
- the main body 134 is constituted by the frame 1 19, the rear plate 1 33, the casing 1 31, and the like.
- the liquid crystal display unit 112 is disposed on the front side B2 of the main body 134, and the substrate assembly 109 is disposed in the main body 134.
- a first opening 135 is formed at an appropriate position on the rear plate 133.
- the main body 134 is composed of a frame 1 19, a casing 13 1, and a rear plate 133.
- An opening 132 is formed on the front side B2 of the casing 131. That is, the main body 134 has a first opening 135 formed on the rear surface side C2, and is substantially box-shaped.
- Flanges 13 6, 13 7, and 13 8 are formed around the first opening 13 5 of the rear plate 13.
- the cover 139 is made of, for example, a metal plate and has a stepped shape. The stepped portion of the cover 13 (near the tip) abuts against the inner surface of the rear plate 133, and the cover 139 is placed on the flanges 136, 137, 138. Two bolts (not shown) pass through holes formed in the cover 13 and are fixed to holes formed in the flange 138.
- a cover 139 covering the first opening 135 of the rear plate 133 is provided.
- the cover 139 is provided detachably with respect to the main body 134.
- Strengthening plates 120 and 121 are provided so as to abut on opposing inner surfaces of the main body 134 (specifically, opposing inner surfaces of the frame 119).
- the mounting plate 125 is supported by the reinforcing plates 120 and 121.
- the circuit boards 108 that make up the board assembly 10 9 are spacers 140, 141 It is supported (fixed) by a mounting plate 125 through the like (see Fig. 7).
- the shield plate 142 is made of, for example, a plate material for shielding electromagnetic waves, and is formed in a substantially box shape. In this way, the shield plate 142 is attached to the circuit board 108 or to the mounting plate 125 so as to cover the board assembly 109.
- the hard disk drive 117 has, for example, a casing made of a metal plate formed on the outside.
- the above casing of the hard disk drive 117 has three flanges, each of which has a hole (see Fig. 6).
- the hard disk drive 1 17 is mounted on the shield plate 14 2 at the designated position. Then, three bolts through each hole formed in the hard disk drive 1 1 7, is fixed to a hole formed in the shield plate 1 4 2 (see FIG. 6) c hard disk drive 1 1 7 To remove, remove the two bolts that secure the cover 13 and remove the force bar 13. Then, by removing the three bolts fixing the hard disk drive 117, the hard disk drive 117 can be removed.
- the hard disk drive 117 can be removed by removing the cover 133 without removing the rear plate 133 entirely. That is, the hard disk drive 117 is detachably provided through a first opening 135 formed in the main body 134.
- the portion located below the hard disk drive 117 (farther from the second power supply unit 116 and closer to the force plate 120) has a second opening 1 43 Are formed (see Fig. 5).
- the memory 118 is fixed on the circuit board 108 so as to be located below the second opening 144.
- the memory 118 can be removed from the circuit board 108. If you want to install the memory 118, first install the memory 118 on the circuit board 108. Next, the node disk drive 1 17 is mounted on the shield plate 14 2, and the cover 13 9 is mounted on the main body 13 4. In this way, by fixing the memory 118 on the circuit board 108 so as to be located below the second opening 144 of the shield plate 142, the memory 118 is detachable. Has become.
- FIG. 8 is a block diagram showing an electrical configuration of a display device 201 according to the third embodiment.
- an input unit 202 includes a connector or the like, and is connected to, for example, a DVD player (not shown), and receives a video signal.
- the input unit 202 outputs image signals R, G, and B and synchronization signals HD / C S YNC and VD from the video signal.
- the D terminal 203 is connected to a DVD player and outputs a high-quality video signal YPbPr.
- Terminal 204 outputs a composite video signal CVBS, and terminal 205 outputs a color signal Y / C and the like.
- the selector 206 selects the video signal R, G, B or the high-quality video signal YPbPr according to the control signal from the control circuit 207, and outputs the selected video signal to the video decoder 208. I do.
- the component board 209 is constituted by the selector 206 and the control circuit 207.
- the video decoder 208 receives a composite signal CVBS, a color signal Y / C, a video signal selected by the selector 206, a synchronization signal HD / C SYNC, and the like.
- the video decoder 208 returns the encoded data to the original data. It also has an A / D converter.
- the ding racer 210 combines the ODD signal output from the video decoder 208 and the EVEN signal, and outputs the combined signal to the scaler 211.
- a video board 212 is constituted by the video decoder 208 and the ding racer 210.
- the input unit 2 13 is composed of a connector, etc., is connected to a personal computer, and when a video signal is input, the input unit 2 13 converts the video signal into image signals R, G, B, and a synchronization signal HD. , VD to selectors 2 1 and 4.
- Data converter 2 1 5 consists AZD converter converts the input from the selector 2 14 into a digital signal, and outputs it to the scaler 2 1 1. That is, the data converter 215 receives the input of the image signals R, G, B and the synchronization signals HD, VD, etc., converts them into digital signals, and outputs the digital signals. The data converter 215 also outputs a dot clock signal to the scaler 211.
- the scaler 211 is, for example, an IC (Integrated Circuit Element) incorporating a microphone port computer or the like.
- the scaler 211 converts the digital signals converted from the image signals R, G, B into image data according to the image size (for example, WXGA) of the liquid crystal panel 217. In this way, the scaler 211 outputs the image data to the transmitter 216.
- the transmitter 2 16 converts the input image data into a low-level differential transmission signal LVDS (LoVoltage Differential Sigana 1) and sends the above signal LVDS to the liquid crystal panel 217. Is output. That is, the transmitter 216 receives the input of the image data and outputs the transmission signal LVDS to the liquid crystal panel 217.
- LVDS Low-level differential transmission signal
- the board assembly 220 is composed of the unit 2 15, the scaler 211, the transmitter 216, the DC-DC converter 218, the cooling fan controller 219, and the like.
- a selector 214 is arranged on the substrate 220a.
- the liquid crystal panel 211 includes a liquid crystal display and a plurality of backlights (both not shown).
- the cable set 227 includes a power plug 228, a cable 229, a connector 230, and the like.
- the power plug 228 has two first conductive pins (round bars) at predetermined pitches (intervals), for example, according to the specifications of the destination.
- Cable 229 consists of two coated leads. One end of each lead wire of the cable 229 is connected to each first conductive pin of the power plug 228. The other end of each lead wire of the cable 229 is connected to each first conductive cylinder of the connector 230. I have. As a result, each of the first conductive pins of the power plug is electrically connected to each of the first conductive cylinders of the connector 230.
- the first connector 231 has two conductive pins 245 having a predetermined shape (for example, a cylindrical shape).
- a predetermined shape for example, a cylindrical shape
- hollow portions 245 a are formed around the two conductive pins 245, respectively (see FIG. 10).
- the first connector 231 may include a plurality of conductive tubes having a predetermined shape (for example, a cylindrical shape). In addition, unlike the above description, the first connector 231 may have three conductive pins (columnar shape) as necessary.
- the first conductive cylinder of the connector 230 is formed so as to protrude from the front surface.
- the first conductive cylinder which is provided on the connector 230 and protrudes, is inserted into the hollow portion 245 a of the first connector 231 so that each of the first conductive cylinders and the first connector
- Each of the 2 3 1 conductive pins 2 4 5 is configured to be electrically connected.
- Two lead wires (only one is shown in FIG. 8) are wired between the first connector 2 31 and the connector circuit 222.
- the second connector 232 is composed of, for example, a female connector, and has two second conductive cylinders 232a having a predetermined shape (for example, a cylindrical shape).
- the pitch of each second conductive tube 2 32 a of the second connector 2 32 is provided, for example, to be the same as the pitch of each first conductive pin of the power plug 228.
- the second connector 2 32 supplies power to other devices (both not shown) via a cable or the like.
- Two lead wires (only one is shown in FIG. 8) are provided between the second connector 2 32 and the connector circuit 222. Two lead wires are provided between the power switch 2 3 3 and the connector circuit 2 2 2.
- the lead wire on one side connected to the second connector 232 (connected to one side of the second conductive cylinder 233a of the second connector 232) is 1 Connected to the lead wire on the 1 side connected to connector 2 3 1 (connected to 1 side of conductive pin 2 45 of 1 connector 2 3 1).
- the other lead wire connected to the second connector 2 32 (connected to the other side of the second conductive tube 2 32 a of the second connector 2 32) is connected to the first connector 2 3 1 Lead on the other side connected to (Connected to the other side of the conductive pin 2 4 5 of the connector 2 3 1).
- each of the second conductive tubes 2 32 a of the second connector 2 32 is electrically connected to each of the conductive pins 2 45 of the first connector 2 31.
- the lead on the first side connected to the power switch 233 is connected to the lead on the first side connected to the first connector 231.
- Two lead wires are wired between the connector circuit 222 and the power supply board 222 (only one is shown in FIG. 8).
- one lead wire is connected to the other lead wire connected to the first connector 231.
- the lead wire on the other side is connected to the lead wire on the other side connected to the power switch 233.
- two lead wires are provided between the connector circuit 222 and the power supply board 222 (only one is shown in FIG. 8).
- the lead wire on one side is connected to the lead wire on the other side connected to the first connector 231.
- the other lead wire is connected to the other lead wire connected to the power switch 233.
- the output side of the power plug 2 228 is connected to the power supply boards 2 2 3 and 2 2 4 via the cable set 2 27, the first connector 2 3 1, and the connector circuit 2 2 2
- the voltage from the commercial power supply applied between the two first conduction pins on the input side of the power plug 228 is applied to the power supply boards 222, 224.
- the power supply board 2 23-2 24 includes a transformer and a rectifier circuit, and supplies a DC voltage set to a predetermined voltage.
- the power supply board 223 supplies a DC voltage to the inverter 225, and the power supply board 224 supplies a dc voltage to the inverter 226.
- the inverters 225 and 226 drive the respective backlights (not shown) of the liquid crystal panel 217.
- the power supply board 223 supplies a predetermined DC voltage to the DC-DC converter 218.
- the DC-DC converter 218 includes a liquid crystal panel 211, a scaler 211, a selector 206, a control circuit 207, a video decoder 208, and a din.
- the power supply voltage is supplied to each of the tareser 210, the selector 214, the data converter 215, the transmitter 216, the cooling fan controller 219, and the like.
- FIG. 9 is a drawing of the display device 201 viewed from the back when the rear plate (not shown) is removed.
- the upper, lower, right, and left sides in the figure will be described as upper, lower, right, and left sides, respectively.
- FIG. 10 FIG. 11A, FIG. 11B, FIG. 11C, FIG. 12, FIG. 13A, FIG. 13B, and FIG. 13C.
- the same components as those in FIG. 8 are denoted by the same reference numerals, and the description may be omitted.
- the frame 234 is made of, for example, a stainless steel plate, is formed in a substantially frame shape when viewed from a plane, and is formed in a shape in which the front side and the back side are open. A plurality of bent portions are formed at appropriate places on the back side of the frame 234.
- the first and second forcing plates 2 3 5 and 2 3 6 are both made of extruded aluminum, for example, and have a substantially convex cross-section and a substantially rectangular parallelepiped when viewed from a plane. It is formed.
- first force plate 2 35 and the second force plate 2 36 is in contact with the inner surface of the frame 234.
- the other end face of each of the first reinforcing plate 2 35 and the second reinforcing plate 2 36 is also in contact with the inner surface of the frame 2 34. In this manner, the first reinforcing plate 2 35 and the second reinforcing plate 2 36 are fixed to the frame 234 by bolts (not shown) or the like.
- the cooling fan 237 includes, for example, a fan, a fan casing, a motor, and the like.
- the left end of the cooling fan 237 is fixed to the first strong plate 235 by bolts.
- the cooling fan 238 includes, for example, a fan, a fan casing, a motor, and the like.
- the right end of the cooling fan 238 is fixed to the second strong plate 236 by bolts.
- the mounting plate 239 is made of, for example, a metal plate or the like. The left end is fixed to the first reinforcing plate 235 by bolts, and the right end is fixed to the frame 234 by bolts.
- the power supply board 224 is fixed on the mounting plate 239 via a spacer (not shown).
- the mounting plate 240 is made of, for example, a metal plate, and the left end is fixed to the frame 234 by bolts.
- the power supply board 223 is fixed on the mounting plate 240 via a spacer (not shown).
- the rear part 241 of the main body is made of, for example, a metal plate or the like.
- the left end is fixed to the second reinforcement plate 236 by bolts, and the right end is fixed to the first reinforcement plate 235 by bolts.
- the liquid crystal panel 2 17 (not shown in FIG. 9) is composed of, for example, a 40-inch liquid crystal display and a plurality of backlights, and has a substantially rectangular parallelepiped outer shape.
- the liquid crystal panel 217 is fixed to the inner side of the frame 234 by bolts or the like.
- a transparent plate (both not shown) is arranged on the front side of the liquid crystal panel 217 via a packing.
- the casing 242 is made of, for example, a metal plate or the like, and is formed in a box shape with a bottom. An opening (not shown) is formed on the front side of the casing 24. Through the opening, the transparent plate and the liquid crystal panel 217 are configured to be viewed from the front by the user.
- a hole is formed in the side surface of the casing 242, and a bolt passes through the hole, is provided in the frame 234, and is fixed to the threaded hole.
- the casing 242 is provided so as to cover the frame 234 and the liquid crystal panel 217.
- the rear plate (not shown) is made of, for example, a metal plate or the like, and is formed so as to cover the rear surface of the frame 234 except for the rear portion 241 of the main body.
- Bolts (not shown) pass through holes formed in the rear plate and are fixed to holes located at the bent portions of the frame 234. In this way, the rear plate (not shown) is fixed to the open back side of the casing 242.
- the main body 243 is constituted by the frame 234, the rear portion 241 of the main body, the rear plate, the casing 242, and the like.
- FIGS. 10, 11A, 11B and 11C the configuration of the first fixing plate 244 used in the display device 201 and its surroundings will be described mainly with reference to FIGS. 10, 11A, 11B and 11C.
- FIG. 10 FIG. 11A, FIG. 11B and FIG. 11C
- the same components as those in FIG. Fig. 10 is a cross-sectional view of A3—A3 in Fig. 9, and Fig. 11A is the first fixing plate.
- FIG. 24 is a plan view of FIG. 24, FIG. 11B is a front view of the first fixing plate 244, and FIG. 11C is a side view of the first fixing plate 244.
- the first connector 2 31 has two conductive pins 2 45 on the front side B 3.
- the two conductive pins 245 are formed in a predetermined shape (for example, a column shape) at predetermined intervals. If necessary, the first connector 2 31 may have three conductive pins (one of which is for grounding).
- the first connector 2 31 is for supplying power for the liquid crystal panel 2 17.
- the left end of the mounting plate 239 is fixed to the right side of the first reinforcing plate 235 by bolts.
- An opening 246 is formed on the front side of the casing 242.
- a transparent plate 247 is disposed on the front side of the liquid crystal panel 217 via a packing (not shown). As described above, the liquid crystal panel 2 17 is disposed in the main body 2 43.
- the rear part 241 of the main body is formed in a crank shape (stepped shape).
- the upper part of the rear part 241 of the main body is fixed to the left side of the first reinforcing plate 235 by bolts.
- the first standing wall part 248 is a vertical part connecting the upper part and the lower part.
- the first opening portion 249 is formed in the first standing wall portion 248 and is a substantially rectangular window.
- the main body 243 is a box-shaped one in which a first opening 249 is formed.
- a first standing wall portion 248 is formed in the main body 243 (specifically, a rear portion 241 of the main body), and a first opening 249 is formed in the first standing wall portion 248.
- the first fixing plate 244 is made of, for example, a metal plate or the like. As shown in FIG. 11A, FIG. 11B and FIG. 11C, the first fixing plate 244 is, for example, a first horizontal portion 250, a first vertical portion 251 and a claw 252. , 253, a second opening 254, a third opening 255, and the like.
- the first vertical part 25 1 is bent perpendicularly to the first horizontal part 250.
- the claws 25 2 and 25 3 are bent perpendicularly to the first vertical portion 25 1.
- the second opening portion 254 is formed in the substantially vertical window at the first vertical portion 251.
- the third opening 255 is formed in a substantially rectangular window in the first vertical part 25 1.
- a gap 256 having a predetermined distance is formed between the claw 252 and the first vertical portion 251.
- a gap 257 having a predetermined distance is formed between the claw 25 3 and the first vertical portion 25 1.
- the first fixing plate 244 is formed by the above parts.
- the first connector 231 is inserted into a second opening 254 formed in the first fixing plate 244.
- a hole (not shown) is formed in the flange 260 of the first connector 231.
- a bolt (not shown) passes through the hole of the flange 260 and is screwed into a hole 259 formed in the first fixing plate 24. In this way, the first connector 2 3 1 is fixed to the first fixing plate 2 4 4.
- the power switch 233 is inserted into a third opening 255 formed in the first fixing plate 244.
- a hole (both not shown) is formed in the flange of the power switch 2 33.
- the port (not shown) passes through the hole of the flange of the power switch 233 and is screwed to a hole 258 formed in the first fixing plate 244. In this way, the power switch 233 is fixed to the first fixing plate 244.
- the claw 2 52 and the claw 2 5 3 of the first fixing plate 2 4 4 to which the first connector 2 3 1 and the power switch 2 3 3 are fixed are attached to the first upright wall 2 4 8 at the rear of the main body by the operator. It is inserted into the formed first opening 249.
- the operator slides the first fixing plate 244 in the E direction (see FIG. 9), so that the claws 252 and 253 are located near the first opening portion 249. It is sandwiched and fixed by the first standing wall portion 248. That is, at this time, the flesh portion of the first upright wall portion 248 is sandwiched in the gaps 256, 257 between the claws 25 2, 25 3 and the first vertical portion 25 1.
- the operator passes the first fastening component (for example, a bolt) 26 1 through a hole formed in the first horizontal portion 250 of the first fixing plate 24 4, and then moves the rear portion 2 4 Fasten to the hole formed in the lower part of 1. That is, the first horizontal portion 250 is fixed to the rear portion 241 of the main body by the first fastening part 261.
- first fastening component for example, a bolt
- the first connector 2 3 1 is inserted such that the rear side C 3 of the first connector 2 3 1 projects into the main body 2 43 through the first opening 2 49. 1st fixing A plate 244 is provided.
- the first fixing plate 244 is detachably fixed to the main body 243 so that the front side B 3 of the first connector 2 31 is exposed. That is, when attaching the first fixing plate 244, as described above, the operator inserts the claws 25 2 and 25 3 into the first opening 24 9 and the claws 25 2 and 25 All you have to do is slide 3 in the E direction (see Fig. 9) and fasten the first fastening part 2 61.
- the operator removes the first fastening part 261, slides the claws 252, 253 in the F direction (see FIG. 9), and removes the first fixing plate. It is only necessary to move the plate 2 44 to the front side B 3.
- the first fixing plate 244 fixes the power switch 23 3 so that the rear side C 3 of the power switch 23 3 projects through the first opening 249 into the inside of the main body 243.
- the first fixing plate 244 is detachably fixed to the main body 243 so that the front side B3 of the power switch 23 is exposed.
- FIG. 13 A is a side view of the second fixing plate 26 2
- Fig. 13 B is a plan view of the second fixing plate 26 2
- Fig. 13 C is a second fixing plate 26 2
- the second connector 2 32 is formed with two second conductive tubes 2 32 a on the front side B 4.
- the two second conductive cylinders 2332a are formed in a predetermined shape (for example, a cylindrical shape) at predetermined intervals. If necessary, the second connector 232 may have three conductive tubes (one of which is for grounding).
- the second connector 232 supplies power to other devices (both not shown) via a cable or the like.
- the second connector 2 32 has a predetermined shape (for example, a cylindrical shape) second conductive cylinder 2 32 a formed on the front side B 4, and is electrically connected to the first connector 2 3 1 It was done.
- the right end of the mounting plate 240 is fixed to the left side of the second reinforcing plate 236 by bolts.
- the rear part 241 of the main body is formed in a crank shape (stepped shape) (see Fig. 12).
- the upper part of the rear part 241 of the main body is fixed to the right side of the second reinforcing plate 236 by bolts.
- the second standing wall part 263 is a vertical part connecting the upper part and the lower part.
- the fourth opening 264 is formed in the second standing wall 263 and is a substantially rectangular window.
- the second fixing plate 262 is made of, for example, a metal plate or the like. As shown in FIG. 12, FIG. 13 A, FIG. 13 B, and FIG. 13 C, the second fixing plate 26 2 is, for example, a second horizontal portion 2 65 and a second vertical portion 2 66. A bent portion 267 and a fifth opening 268 are formed.
- the second vertical portion 266 is bent perpendicularly to the second horizontal portion 265.
- the fifth opening portion 268 is a window having a predetermined shape in the second vertical portion 266 (see FIG. 13A).
- a sixth opening 269 is formed at an appropriate position in the rear part 241 of the main body.
- a gap 270 is provided between the bent portion 271 of the second fixing plate 262 and the right side of the sixth opening 269.
- the second connector 232 is inserted into the fifth opening 268 formed in the rear part 241 of the main body (more specifically, formed in the second fixing plate 262). Thus, it is fixed to the second fixing plate 26 2.
- the operator moves the second fixing plate 2 65 to which the second connector 2 32 is fixed to the front side B 4, and moves the second horizontal portion 2 65 and the second vertical portion 2 of the second fixing plate 2 62.
- the concave portion 272 formed by 66 and the bent portion 271 is inserted into the sixth opening 269.
- the upper end of the bent portion 267 passes through the lower end of the second standing wall portion 263, and the bent portion 267 contacts the inner surface of the second standing wall portion 263.
- the operator passes the second fastening part (for example, bolts) 273 through a hole formed in the second horizontal portion 265 of the second fixing plate 262, and the body 243 Into the hole formed in the rear part 24 1. In this way, the second fixing plate 26 2 is easily attached to the main body 2 43.
- the second horizontal portion 265 is fixed to the rear portion 241 of the main body by the second fastening part 273.
- the bent portion 2667 is fixed by abutting on the inner surface of the second standing wall portion 263 located near the fourth opening portion 264.
- the second fixing plate 262 is detachably fixed to the main body 243 so that the front side B4 of the second connector 2332 is exposed.
- the display device 201 is configured by the above components.
- Fig. 14 is a block diagram showing an electrical configuration of a display device 301 (hereinafter, may be simply referred to as "device 301J") according to the fourth embodiment.
- a display device will be described as an example of a device to which the present invention is applied.However, since the present invention is not limited to a display device, the display device in the fourth embodiment is read as a device with a protection circuit. In other words, in the following description, “display device 301 or device 301” is completely replaced with “device 301 with protection circuit” as it is (replacement). It is possible.
- FIG. 15 is an electric circuit diagram of the monitoring unit 302 used in the device 301.
- Figure 16 is an electric circuit diagram of a return section 303 used in the device 301.
- the load section 304 has at least a display section (not shown).
- the display unit includes, for example, a DCZDC converter, an inverter, a backlight, a driving unit, a liquid crystal panel, a transmitter, a signal processing unit, and the like.
- the first power supply section 305 includes, for example, a transformer, a rectifier circuit, and a switching circuit, and has an input side connected to an output side of the power supply plug 306.
- the input side of the power plug 306 is inserted into a power outlet (not shown) to receive supply of commercial power.
- the output side of the first power supply unit 305 is connected to the load unit 304 and connected to the control unit 308.
- the commercial power supply voltage V I (for example, AC 100 volt) is input to the first power supply section 305.
- the first power supply section 305 supplies a voltage VT (for example, 14 VDC) to the load section 304 (supplying power), and supplies a voltage VP (for example, (5 VDC, etc.) (supply power).
- VT for example, 14 VDC
- VP for example, (5 VDC, etc.
- the second power supply unit 307 includes, for example, a transformer and a rectifier circuit, and the input side is connected to the output side of the power plug 306.
- the output side of the second power supply unit 307 is connected to a power supply terminal (not shown) of the return unit 303 and a power supply terminal (not shown) of the monitoring unit 302.
- the commercial power supply voltage VI is input to the second power supply section 307. Then, the second power supply unit 307 supplies the respective voltages V C (for example, DC 5 volts or the like) to the return unit 303 and the monitoring unit 302 (supply power).
- V C for example, DC 5 volts or the like
- the control unit 308 is made of, for example, a CPU or the like, and is connected to a ROM (Read Only Memory) or the like (not shown).
- the control unit 308 receives the supply of the voltage VP from the first power supply unit 305 and controls the load unit 304 and the like according to the control program stored in the ROM.
- the input side of the monitoring section 302 is connected to the load section 304 to monitor the voltage of the load section 304, and the operation state of the control section 310 and the temperature of the control section 308. It is connected to the control unit 308 to monitor the status. In this way, the monitoring unit 302 The load section 304 and the control section 308 are monitored.
- the output side of the monitoring unit 302 is connected to the input side of the return unit 303, and the monitoring unit 302 outputs an alert signal AL to the return unit 303.
- the input side of the return unit 303 is connected to the monitoring unit 302.
- the output side of the return section 303 is connected to the control terminal (not shown) of the first power supply section 305, and the return section 303 sends the control signal P to the first power supply section 305. Output.
- the return section 303 controls the first power supply section 305.
- Each of the above components (monitoring section 302, return section 303, load section 304, first power supply section 305, power supply plug 306, second power supply section 307, control section 308)
- the device 301 is configured.
- the voltage monitoring unit 309 includes, for example, a comparator and a logic circuit, and the input side thereof is connected to the input side of the load unit 304.
- the output side of the voltage monitoring unit 309 is connected to one input side of the OR circuit 310 of negative logic.
- the voltage monitoring unit 309 outputs a high (high potential) signal when the voltage of the load unit 304 is normal (for example, in the range of 13 to 15 volts). If the voltage of the load 304 is abnormal (for example, less than 13 volts or more than 15 volts), a low (low voltage) signal is output.
- the voltage monitoring unit 309 detects whether the voltage of the load unit 304 is normal or abnormal.
- the temperature monitoring unit 311 includes, for example, a thermistor and a logic circuit, and the thermistor is disposed, for example, on the control unit 3108.
- a temperature sensing unit may be incorporated in the control unit 308, and the temperature sensing unit may be connected to the above-described logic circuit via a conductive unit (not shown). As described above, the temperature monitoring unit 311 detects whether the temperature of the control unit 308 is normal or abnormal.
- the thermistor constituting the temperature monitoring section 311 may be provided in the load section 304. That is, the thermistor may be arranged on a circuit board (not shown) constituting the load section 304. Further, it may be arranged so as to detect the ambient temperature of the circuit board. That is, in FIG. 14, the electrical configuration is shown so as to monitor only the temperature state of the control unit 3 08. However, the temperature monitoring unit 3 11 1 is replaced with the load unit 3 0 8 instead of the control unit 3 08. Whether the temperature of 4 is normal or abnormal may be detected.By providing a plurality of thermistors, the normal and abnormal temperatures of both the control unit 308 and the load unit 304 can be detected. It may be.
- the temperature monitoring section 311 When the temperature of the load section 304 or the temperature of the control section 308 is normal (for example, within each allowable value), the temperature monitoring section 311 outputs a high signal. If the temperature of the load section 304 or the temperature of the control section 308 is abnormal (for example, exceeds each allowable temperature), the temperature monitoring section 311 outputs a low signal.
- the temperature monitoring unit 311 When the temperature monitoring unit 311 simultaneously monitors both the normal and abnormal temperatures of both the control unit 308 and the load unit 304, the temperature monitoring unit 311 Outputs a mouth signal when at least one of 8 and load section 304 is abnormal, and outputs a high signal when both are normal.
- the output side of the temperature monitoring unit 311 is connected to another input side provided in the OR circuit 310 of negative logic. '
- the control unit monitoring unit 312 includes, for example, a watchdog timer, and the input side thereof is connected to the control unit 3108.
- the output side of the control section monitoring section 312 is connected to one input side provided in the negative logic circuit 313.
- the control unit 308 accesses the control unit monitoring unit 312 periodically. When detecting that the access has been made, the control unit monitoring unit 312 determines that the operation of the control unit 308 is normal, and outputs a high signal.
- control unit monitoring unit 312 determines that the operation of the control unit 308 is abnormal (for example, a runaway). And outputs a low signal.
- the output side of the negative logic OR circuit 310 is connected to another input side provided in the negative logic OR circuit 310.
- the output side provided in the OR circuit 313 of the negative logic is connected to the output terminal 314.
- the voltage monitoring unit 309, the temperature monitoring unit 311 and the control unit monitoring unit 3 When at least one of 12 detects an abnormality (outputs a low signal) of each monitoring target, a low signal is applied to the output terminal 3 14.
- the output terminal 3 14 is connected to the input side of the return section 3 0 3 so that an alert signal AL applied to the output terminal 3 14 is transmitted to the return section 3 0 3.
- a parallel circuit 315 is formed by connecting an FET (field effect transistor) and a diode in parallel.
- the gate of the FET is connected to the output terminal 314, and the source and the diode node of the FET are grounded.
- the drain of the FE and the cathode of the diode in the parallel circuit 315 are shared and connected to an intermediate point of a series circuit composed of the resistor 316 and the capacitor 317.
- the voltage VC is applied to one end of the resistor 316, and one end of the capacitor 317 is grounded.
- the midpoint of the series circuit consisting of the resistor 3 16 and the capacitor 3 17 is connected to the input side of the knot circuit U 1, and the output side of the knot circuit U 1 is connected to one input side of the NAND circuit U 3 It is connected to the.
- the output side of the NAND circuit U3 is connected to the conductive line 318.
- the output side of the NAND circuit U3 is connected to one input side provided in the NAND circuit U4.
- the midpoint of the series circuit consisting of the resistor 319 and the capacitor 320 is connected to the input side of the amplifier U8.
- the voltage VC is applied to one end of the resistor 319, and one end of the capacitor 320 is grounded.
- the output side of the amplifier U8 is connected to one input side provided in the AND circuit U2.
- the other input side provided in the AND circuit U2 is connected to the output side of the NAND circuit U6.
- the output side of the AND circuit U 2 is connected to the other input side provided in the NAND circuit U 4 It is connected to the.
- the output side of the NAND circuit U4 is connected to another input side provided in the NAND circuit U3.
- These NAND circuits U 3, U 4, etc. constitute an RS flip-flop circuit 318a.
- the input side of the knot circuit U7 is connected to the conductive line 318, and the output side of the knot circuit U7 is connected to the output terminal 321.
- the midpoint of the series circuit composed of the resistor 3222 and the capacitor 3223 is connected to the REXTZCEXT terminal of the integrated circuit element U5.
- a voltage V C is applied to one end of the resistor 3222, and one end of the capacitor 317 is grounded.
- the voltage V C is applied to the power supply terminal of the integrated circuit element U5.
- the clear (CLR) terminal provided on the integrated circuit element U5 is connected to the conductive line 318.
- a monostable multivibrator circuit 324 is constituted by the integrated circuit element U5, the resistor 322, the capacitor 322, and the like.
- the conductive line 318 is connected to one input side provided in the NAND circuit U6 via the resistor 325 and the conductive line 326.
- the midpoint between the resistor 325 and the conductive wire 326 is grounded via the capacitor 327.
- the output terminal provided on the integrated circuit element U5 is connected to another input side provided on the NAND circuit U6.
- the return part 303 is constituted by the above components.
- the output terminal 3 1 4 Outputs a high signal. If at least one of the temperature, the voltage, and the operation is abnormal, the output terminal 314 outputs a low signal.
- the initialization circuit 320a composed of the resistor 319, the capacitor 320, and the amplifier U8 is a circuit for initializing the return section 303.
- the initialization is performed by setting the clear signal CL (the signal output from the amplifier U8) to a low state.
- the configured circuit operates so that the knot circuit U1 does not output a low signal unless the alert signal AL becomes a low signal for a fixed time or more.
- the circuit constituted by the NAND circuits U 3, U 4, etc. is the RS flip-flop circuit 318 a holding the state. Even if the output of the knot circuit U1 changes from a high signal to a high signal and then returns to a high signal, the signal to the input terminal provided in the NAND circuit U4 receiving the output of the AND circuit U2 is a low signal. Until, the RS flip-flop circuit 318 a holds the output state of the NAND circuits U 3 and U 4 so that a high signal is output from the output side of the NAND circuits U 3 and U 4.
- the circuit constituted by the resistor 3222, the capacitor 3223, and the integrated circuit element U5 is a monostable multivibrator circuit 3224.
- the above monostable multi-bi-preprocessor circuit 3 2 4 has the time constant of the resistor 3 2 2 and the capacitor 3 2 3. Generates a pulse of the determined time width. This pulse gives time to keep the control signal P applied to the output terminal 3221 low.
- FIG. Figure 17 shows the clear signal CL output from the amplifier U8, the alert signal AL applied to the output terminals 3 14, the input signal to the knot circuit U1 (U1 input), and the knot circuit U Output signal from 1 (U1 output), Output signal from NAND circuit U3 (U3 output), Output signal from NAND circuit U4 (U4 output), Output signal from integrated circuit element U5 (Nand)
- the signal applied to one input terminal of the circuit U6; U5 output), the output signal from the NAND circuit U6 (U6 output), and the voltage waveform of the control signal P applied to the output terminal 3 21 This is shown on the horizontal axis.
- the user inserts the power plug 306 into a power outlet (not shown) at timing T O.
- the commercial power supply voltage VI is applied to the first power supply section 305, and the commercial power supply voltage VI is applied to the second power supply section 307.
- the second power supply unit 307 starts supplying the voltage VC to the monitoring unit 302 and the return unit 303.
- the initialization circuit 320a outputs the clear signal CL of the row signal for a time determined by the time constant defined by the resistor 310 and the capacitor 320, and outputs After a reset, a high signal is output.
- a switching circuit constituting the first power supply section 305 is closed.
- the temperature of the control section 308, the voltage of the load section 304, and the operation of the control section 308 are all normal at the time of inputting.
- the alert signal AL becomes a high signal (see the timing between T0 and T1 in FIG. 17). Therefore, the input (U1 input) and the output (U1 output) of the knot circuit U1 become a low signal and a high signal, respectively, at the beginning of the supply of the voltage VC.
- the output of the AND circuit U2 becomes a low signal upon receiving the clear signal CL of the low signal, so that the output of the NAND circuit U4 (U4 output) changes from an undefined state to a high signal.
- the output (U3 output) of the NAND circuit U3 changes from an undefined state to a low signal.
- the low signal from the NAND circuit U3 is received by its own clear (CLR) terminal, and the output of the integrated circuit element U5 (U5 output) changes from an undefined state to a high signal.
- the output of the NAND circuit U6 changes from an undefined state to a high signal.
- control signal P applied to the output terminal 321 can be set to a high signal at the same time as the voltage VC is supplied.
- the high signal is maintained even after the output of the NAND circuit U3 is fixed from the undefined state to the open state.
- the control unit 308 starts to run away.
- the monitoring unit 302 detects that the load unit 304 and / or the control unit 308 is abnormal. That is, at least one of the monitoring unit 302 and the temperature of the load unit 304 or the control unit 308, the voltage of the load unit 304, and the operation of the control unit 308 is abnormal. Detect something.
- the alert signal AL changes from a high signal to a low signal (see the alert signal AL in FIG. 17).
- the output of the NOT circuit U 1 (U 1 output) 1 Mallory varying from high signal to low signal, the output of the NAND circuit U 3 (U 3 output), c varies from low signal to high signal then NAND the output of the circuit U 4 (U4 output), also c changes from high signal to low signal, this time, is applied to the NOT circuit U 7 the output terminal 3 2 1 connected to the output side of the NAND circuit U 3 through The control signal P is switched from the high signal to the mouth signal, and the control signal P is supplied to the first extinguishing unit 305.
- the first power supply unit 305 Upon receiving the control signal P switched to the row signal, the first power supply unit 305 stops supplying the voltage VT to the load unit 304 and supplying the voltage VP to the control unit 308.
- the monitoring unit 302 is configured such that when the supply is stopped, the alert signal AL returns from the low signal to the high signal (timing T2). When the alert signal AL returns to a high signal, the input of the knot circuit U1 (U1 input) switches to a low signal, and then the output of the knot circuit U1 (U1 output) switches to a high signal.
- the monostable multivibrator circuit 324 generates a low-state pulse having a time width determined by the time constant of the resistor 322 and the capacitor 323.
- the output of the NAND circuit U3 (U3 output) changes from a low signal to a high signal
- the output of the integrated circuit element U5 (U5 output) changes from a high signal to a low signal, and the low signal for a certain period of time. Is output.
- the NAND circuit U6 continues to output a high signal (see the U6 output in FIG. 17).
- the output of the integrated circuit element U5 changes from a low signal to a high signal. Then, the output of the NAND circuit U6 (U6 output) switches to a low signal, then the output of the NAND circuit U4 (U4 output) switches to a high signal, and the output of the NAND circuit U3 (U3 output) goes low. Switch to signal. Nand circuit U By switching the output of No. 6 (U 6 output) to the high signal and the control signal P to the high signal, the entire circuit returns to the original state (the state immediately before the timing T1).
- the time when the output of the NAND circuit U3 (U3 output) is a high signal is the same as the time when the control signal P is a low signal.
- the control signal P returns to the high signal when the predetermined time TP elapses after the control signal P becomes the low signal.
- the predetermined time TP is in accordance with the time constant of the resistor 3222 and the capacitor 3223.
- the control signal P generated by the return section 303 is input to a switching circuit forming the first power supply section 305 via a control terminal forming the first power supply section 305.
- the switching circuit constituting the first power supply section 305 When the control signal P is a high signal, the switching circuit constituting the first power supply section 305 is closed, and the first power supply section 305 is connected to the load section 304 and the control section 308 by: Supply the voltage VT and voltage VP, respectively, as the power supply voltage.
- the control signal P when the control signal P is a low signal, the switching circuit constituting the first power supply section 305 is opened, and the first power supply section 305 is connected to both the load section 304 and the control section 308. The supply of voltage to is stopped.
- the monitoring unit 302 detects that the load unit 304 and / or the control unit 308 is abnormal, the return unit 303 stops the power supply by the first power supply unit 305. Let me do it.
- the monitoring unit 302 determines at least one of the temperature of the load unit 304 or the control unit 308, the voltage of the load unit 304, and the operation of the control unit 308. When it is detected that one of them is abnormal, it outputs an alert signal AL, which has changed from a high signal to a low signal, to the return unit 303.
- the return unit 303 outputs a control signal P changed from a high signal to a low signal to the first power supply unit 300.
- the switching circuit of the first power supply section 305 is opened. That is, the first power supply unit 3005 stops supplying the voltage VT to the load unit 304, and stops the voltage VP to the control unit 308.
- the return section 303 changes the low signal from the low signal to the high signal to the first power supply section 303.
- the control signal P is output.
- the switching circuit of the first power supply section 305 is closed, and the supply of the voltage VT to the load section 304 and the supply of the voltage VP to the control section 308 by the first power supply section 305 are performed. Supply will resume.
- the first to fourth embodiments described above can be combined with each other as long as there is no contradiction.
- the electrical configuration of the device 301 in the fourth embodiment is changed to the display device 1 in the first embodiment, the display device 101 in the second embodiment, and the display device 201 in the third embodiment. May be applied to 1.
- the present invention (the first present invention) is suitable as a display device having a power supply unit with high reliability and a suppressed temperature rise value, a display device including a liquid crystal panel, a cathode ray tube, or the like, a plasma display, It can be used as a display device such as an organic electroluminescence display.
- the present invention (second invention) is suitable as a display device which can read and write a large amount of data, easily attaches and detaches a storage device, and is inexpensive, and includes a liquid crystal panel, a brown tube, and the like. It can be used as a display device such as a display device, a plasma display, and an organic electroluminescent display.
- the present invention is suitable as a display device in which replacement work of a connector or the like is easy when a destination is changed, a display device provided with a liquid crystal panel, a cathode ray tube, or the like, a plasma display. It can be used as a display device such as an organic electroluminescent display.
- the present invention provides a display device which detects that the voltage of the load, the temperature of the load or the control unit, or the operation of the control unit is abnormal, stops the power supply, and then automatically returns thereafter. It is suitable as a device with a protection circuit, and can be used as a display device equipped with a liquid crystal panel, a cathode ray tube, or the like, a plasma display, a display device such as an organic electroluminescent display.
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/551,166 US20060192927A1 (en) | 2003-03-27 | 2004-03-22 | Display |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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JP2003088174A JP2004294863A (ja) | 2003-03-27 | 2003-03-27 | 表示装置 |
JP2003-088174 | 2003-03-27 | ||
JP2003123802A JP2004328612A (ja) | 2003-04-28 | 2003-04-28 | 表示装置 |
JP2003-123801 | 2003-04-28 | ||
JP2003123801A JP4144424B2 (ja) | 2003-04-28 | 2003-04-28 | 表示装置 |
JP2003-123802 | 2003-04-28 | ||
JP2003-186532 | 2003-06-30 | ||
JP2003186532A JP4207685B2 (ja) | 2003-06-30 | 2003-06-30 | 保護回路付き装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004086130A1 true WO2004086130A1 (ja) | 2004-10-07 |
Family
ID=33102328
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/003892 WO2004086130A1 (ja) | 2003-03-27 | 2004-03-22 | 表示装置 |
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US (1) | US20060192927A1 (ja) |
WO (1) | WO2004086130A1 (ja) |
Families Citing this family (9)
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KR101142468B1 (ko) * | 2004-05-17 | 2012-05-16 | 소니 주식회사 | 전원장치 및 디스플레이장치 |
KR100751318B1 (ko) * | 2004-10-26 | 2007-08-22 | 삼성에스디아이 주식회사 | 판재의 접합 방법, 판재 접합 구조 및 이를 구비한 디스플레이 모듈 |
JP4619310B2 (ja) * | 2005-06-23 | 2011-01-26 | 三洋電機株式会社 | 投射型映像表示装置 |
US20090168905A1 (en) * | 2007-12-28 | 2009-07-02 | Teradyne, Inc. | Decoding of LVDS Protocols |
US9239513B2 (en) * | 2010-11-03 | 2016-01-19 | Tseng-Lu Chien | Laser projection light |
JP5434459B2 (ja) * | 2009-10-14 | 2014-03-05 | パナソニック株式会社 | 映像表示装置の外部機器制御装置 |
US8622554B1 (en) * | 2011-05-26 | 2014-01-07 | Twilight Features, Inc. | Portable weather-resistant unit for video projectors |
US9805689B2 (en) * | 2011-11-30 | 2017-10-31 | Gpo Us, Inc. | Apparatus and method for easy diagnosis, repair, and maintenance of a commercial display screen |
JP7261203B2 (ja) * | 2020-07-22 | 2023-04-19 | シャープ株式会社 | 表示装置、表示装置の制御方法、及び制御プログラム |
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JPH02126377U (ja) * | 1989-03-28 | 1990-10-18 | ||
JPH0336519A (ja) * | 1989-07-04 | 1991-02-18 | Fujitsu Ltd | 液晶表示装置の駆動装置 |
JPH05242987A (ja) * | 1991-11-06 | 1993-09-21 | Hitachi Ltd | 液晶ディスプレイ付き情報処理システム |
JPH063655A (ja) * | 1992-06-17 | 1994-01-14 | Casio Comput Co Ltd | 液晶表示装置 |
JPH08249540A (ja) * | 1995-03-10 | 1996-09-27 | Tec Corp | 商品販売登録データ処理装置 |
JPH09114403A (ja) * | 1995-10-13 | 1997-05-02 | Seiko Epson Corp | 情報処理装置およびケーブルの収納構造 |
JPH09238293A (ja) * | 1996-02-29 | 1997-09-09 | Hitachi Ltd | 液晶表示装置 |
JPH10163671A (ja) * | 1996-11-28 | 1998-06-19 | Mitsubishi Electric Corp | プラズマディスプレイ装置 |
JP2001133781A (ja) * | 1999-11-08 | 2001-05-18 | Hitachi Ltd | 液晶表示装置 |
JP2002006824A (ja) * | 2000-06-23 | 2002-01-11 | Nec Mitsubishi Denki Visual Systems Kk | 表示装置 |
JP2002214709A (ja) * | 2001-01-12 | 2002-07-31 | Sony Corp | プロジェクター |
JP2002341448A (ja) * | 2001-02-15 | 2002-11-27 | Sony Corp | 投射型表示装置 |
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