JP2004004251A - Video display device - Google Patents

Abstract

An object of the present invention is to provide a video display device that can be used by a user with peace of mind when controlling the energization by a power supply by detecting the temperature of the device with a temperature sensor.
A history storage unit (34) for storing information as to whether or not a high-temperature state has been detected by a temperature sensor (30) in the past, and a power supply when the high-temperature state is not stored in the history storage unit (34). When the power is turned on, a signal for starting the power supply is transmitted to the power control unit 35, and if the history storage unit 34 stores information indicating that the high temperature state is detected, whether the current temperature is higher than the lower limit temperature when the power is turned on. The power supply control unit 35 is configured to transmit a signal for determining whether or not the power is supplied to the power supply control unit 35.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video display device such as a plasma display device which is known as a large-screen, thin, and lightweight display device.
[0002]
[Prior art]
In this plasma display device, an ultraviolet ray is generated by gas discharge, and the phosphor is excited by the ultraviolet ray to emit light, thereby performing color display. Then, a display cell partitioned by a partition is provided on the substrate, and a phosphor layer is formed on the display cell.
[0003]
This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. At present, the mainstream of plasma display devices is a surface discharge type having a three-electrode structure, which has a pair of display electrodes adjacent to each other in parallel on one substrate, and a structure on the other substrate. It has address electrodes arranged in a direction intersecting with the display electrodes, partition walls, and a phosphor layer, so that the phosphor layer can be made relatively thick, which is suitable for color display by the phosphor.
[0004]
Such a plasma display device is capable of high-speed display as compared with a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and has a high display quality because it is a self-luminous type. Recently, flat panel displays have attracted particular attention, and have been used for various purposes as display devices at places where many people gather and display devices for enjoying large-screen images at home.
[0005]
Hereinafter, the plasma display device will be described with reference to FIGS.
[0006]
First, the structure of the plasma display panel in the plasma display device will be described with reference to FIG. As shown in FIG. 3, a plurality of rows of stripe-shaped display electrodes 2 formed of pairs of scan electrodes and sustain electrodes are formed on a transparent front substrate 1 such as a glass substrate, and cover the electrode group. A dielectric layer 3 is formed as described above, and a protective film 4 is formed on the dielectric layer 3.
[0007]
A plurality of rows of stripes covered with an overcoat layer 6 are provided on a rear substrate 5 opposed to the front substrate 1 so as to intersect with the display electrodes 2 of scan electrodes and sustain electrodes. Address electrodes 7 are formed. A plurality of partitions 8 are arranged on the overcoat layer 6 between the address electrodes 7 in parallel with the address electrodes 7, and the phosphor layers 9 are provided on the side surfaces between the partitions 8 and on the surface of the overcoat layer 6. I have.
[0008]
The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space therebetween so that the display electrode 2 of the scan electrode and the sustain electrode and the address electrode 7 are substantially orthogonal to each other, and the periphery thereof is sealed. In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. The discharge space is partitioned into a plurality of partitions by partition walls 8, so that a plurality of discharge cells are provided at intersections between the display electrodes 2 and the address electrodes 7, and each of the discharge cells has a red, green, and blue color. The phosphor layers 9 are sequentially arranged for each color such that
[0009]
FIG. 4 shows an electrode arrangement of this plasma display panel. As shown in FIG. 4, the scan electrodes, the sustain electrodes, and the address electrodes have a matrix configuration of M rows × N columns, and M rows in the row direction. Scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged, and N columns of address electrodes D1 to DN are arranged in the column direction.
[0010]
In the plasma display panel having such an electrode configuration, an address discharge is performed between the address electrode and the scan electrode by applying a write pulse between the address electrode and the scan electrode, and after selecting a discharge cell, the scan electrode A sustain discharge is performed between the scan electrode and the sustain electrode by applying a periodic sustain pulse that is alternately inverted between the scan electrode and the sustain electrode, thereby performing a predetermined display.
[0011]
FIG. 5 shows an example of the overall configuration of a plasma display device incorporating the panel having the structure described above. In the drawing, a housing for accommodating a panel 10 is composed of a front frame 11 and a metal back cover 12, and an opening of the front frame 11 has a front surface made of glass or the like which also protects the optical filter and the panel 10. A cover 13 is provided. The front cover 13 is coated with, for example, silver to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 12 is provided with a plurality of ventilation holes 12a for releasing heat generated in the panel 10 and the like to the outside.
[0012]
The panel 10 is held by bonding a front surface of a chassis member 14 made of aluminum or the like through a heat conductive sheet 15, and a plurality of circuits for driving the display of the panel 10 are provided on the rear side of the chassis member 14. A block 16 is attached. The heat conductive sheet 15 is for efficiently transmitting the heat generated in the panel 10 to the chassis member 14 and radiating the heat. Further, the circuit block 16 includes an electric circuit for performing display driving of the panel 10 and controlling the same, and the electrode drawing portion drawn to the edge portion of the panel 10 extends beyond the four edge portions of the chassis member 14. It is electrically connected by a plurality of extending flexible wiring boards (not shown).
[0013]
A boss 14a for attaching the circuit block 16 and fixing the back cover 12 is formed on the rear surface of the chassis member 14 by integral molding using die casting or the like. The chassis member 14 may be configured by fixing a fixing pin to an aluminum flat plate.
[0014]
By the way, in this plasma display device, the temperature of the panel is increased by the discharge in the panel. Therefore, as described above, the structure is such that the heat of the panel is transmitted to and released from the chassis member, and the display drive disposed on the rear side of the chassis member The temperature of the circuit block is added to the heat generated by the operation of the circuit block and becomes higher. For this reason, a temperature sensor is arranged near the circuit block to control the power supply to the power supply before the device enters an abnormal operation state.
[0015]
FIG. 6 shows a block diagram of a conventional control device. In the drawing, reference numeral 20 denotes a temperature sensor disposed near the upper circuit block on the back side of the plasma display device, and 21 denotes a current temperature from the temperature sensor 20. The input temperature information input unit 22 is a lower limit temperature storage unit that stores a lower limit temperature at which power is not supplied even when the power switch is turned on, and the current temperature detected by the temperature sensor 20 and the lower limit temperature storage unit 22 are stored. The determination unit 24 compares the lower limit temperature and generates a signal indicating a high temperature state when the current temperature is higher. The power supply control unit 24 receives a signal indicating the high temperature state from the determination unit 23 and stops power supply. Reference numeral 25 denotes an LED lighting unit that displays an operation state of the power supply so that a user can recognize the operation state.
[0016]
The operation of the conventional apparatus configured as described above will be described. First, in a factory or the like, a value of a lower limit temperature at which power is not supplied even when a power switch is turned on when the power is turned on is stored in the lower temperature storage unit 22. And ship it.
[0017]
When the user performs an operation of turning on a power switch to perform a power-on operation, current temperature information from the temperature sensor 20 is input to the temperature information input unit 21 and transmitted to the determination unit 23. . The determination unit 23 compares the current temperature from the temperature sensor 20 with the lower limit temperature stored in the lower limit temperature storage unit 22, and outputs a signal indicating a high temperature state if the current temperature is higher than the power supply control unit 24 and the LED lighting unit. To 25.
[0018]
The power control unit 24 performs the power-on operation by the user, but performs an operation (stand-by operation) in which the power-on is not performed based on the high-temperature state detection information from the determination unit 23. Further, the LED lighting section 25 performs the LED display indicating the power-on state, but performs the LED display indicating the temperature abnormality based on the detection information of the high temperature state from the determination section 23.
[0019]
[Problems to be solved by the invention]
However, in the above-mentioned conventional configuration, even when the temperature of the outside air is higher than the lower limit temperature, the power-on operation is not performed. However, there is a problem that the power is not supplied even when the power switch is turned on even though the power switch is not abnormal. For this reason, although the device is a normally operating product, the user may misunderstand that the device is a defective product that does not perform a display operation.
[0020]
The present invention has been made in view of the above-described conventional problems, and has as its object to provide a video display device that can be used by a user with peace of mind when detecting the temperature of the device with a temperature sensor and controlling energization by a power supply. I do.
[0021]
[Means for Solving the Problems]
In order to achieve this object, the image display device of the present invention includes a history storage unit that stores information as to whether or not a high-temperature state has been detected by a temperature sensor in the past. If it is not stored, a signal for starting power supply is transmitted to the power supply control unit when the power is turned on, and if information indicating detection of a high temperature state is stored in the history storage unit, the current temperature is stored when the power is turned on. Is determined to be higher than the lower limit temperature, and a signal for controlling power supply to the power supply is transmitted to the power supply control unit.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the invention according to claim 1 of the present invention includes a temperature information input unit to which a current temperature is input from a temperature sensor, and a lower limit temperature storage unit that stores a lower limit temperature at which power is not supplied even when power is turned on. A determination unit that compares the current temperature from the temperature information input unit with the lower limit temperature stored in the lower limit temperature storage unit and generates a signal indicating a high temperature state when the current temperature is higher; and A power supply control unit that stops power supply when a signal indicating a high-temperature state is input, and a history storage unit that stores information on whether a high-temperature state has been detected by a temperature sensor in the past, and the determination unit includes When the information that detected the high-temperature state is not stored in the history storage unit, a signal for starting power supply when the power is turned on is transmitted to the power control unit, and the information that the high-temperature state is detected in the history storage unit. Is remembered When the power is turned on, it is configured to determine whether the current temperature is higher than the lower limit temperature and to transmit a signal to control the power supply to the power control unit. The apparatus can be operated without being affected by the influence, and when the temperature of the apparatus rises to a high temperature state, the power supply operation can be stopped.
[0023]
Hereinafter, a video display device according to an embodiment of the present invention will be described with reference to FIGS.
[0024]
FIG. 1 is a block diagram of a video display device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation flow thereof. First, in FIG. 1, reference numeral 30 denotes a temperature sensor provided near the circuit block on the upper rear side of the plasma display device, 31 denotes a temperature information input unit for inputting a current temperature from the temperature sensor 30, and 32 denotes a power switch. The lower limit temperature storage unit 33 stores the lower limit temperature at which the power is not supplied even if the current temperature is detected, and compares the current temperature detected by the temperature sensor 30 with the lower limit temperature stored in the lower limit temperature storage unit 32, and the current temperature is higher. A determination unit that generates a signal indicating a high-temperature state sometimes, a history storage unit that stores information on whether a high-temperature state has been detected by the temperature sensor 30 in the past, and a reception unit that receives a signal indicating the high-temperature state from the determination unit 33 In the power supply control section for stopping power supply to the power supply, the determination section 33 determines whether the power is turned on when the power is turned on, if the history storage section 34 does not store the information indicating the detection of the high temperature state. Is transmitted to the power supply control unit 35, while if the history storage unit 34 stores information on the detection of the high temperature state, it is determined whether the current temperature is higher than the lower limit temperature when the power is turned on. Then, a signal for controlling power supply to the power supply is transmitted to the power supply control unit 35. Reference numeral 36 denotes an LED lighting unit that displays an operation state of the power supply so that a user can recognize the operation state.
[0025]
Next, the operation of the video display device configured as described above will be described. First, in a factory or the like, the value of the lower limit temperature at which power is not supplied even when the power switch is turned on when the power is turned on is stored in the lower limit temperature storage unit. 32 and shipped.
[0026]
When the user performs an operation of turning on a power switch to perform a power-on operation, current temperature information from the temperature sensor 30 is input to the temperature information input unit 31 and transmitted to the determination unit 33. . At this time, the history storage unit 34 transmits to the determination unit 33 information on whether or not the high temperature state has been detected by the temperature sensor 30 before the power is turned on.
[0027]
When there is no history in which the information of detecting the high temperature state is not stored in the history storage unit 34, the determination unit 33 stores the current temperature from the temperature sensor 30 and the lower limit temperature storage unit 32 as shown in FIG. A certain lower limit temperature is compared, and a signal for continuing the power-on operation of the power-on even if the current temperature is high is transmitted to the power control unit 35 and the LED lighting unit 36.
[0028]
On the other hand, in the case where there is a history in which the information of the detection of the high temperature state is stored in the history storage unit 34, it is determined whether or not the current temperature is higher than the lower limit temperature when the power is turned on as shown in FIG. Is higher than the lower limit temperature, a signal for not energizing the power is transmitted to the power control unit 35 and the LED lighting unit 36, and the power control unit 35 performs the power-on operation by the user. An operation in which power-on is not performed (standby operation) is performed based on the high-temperature state detection information. In addition, the LED lighting section 36 performs the LED display indicating the power-on state, but performs the LED display indicating the temperature abnormality based on the detection information of the high temperature state from the determination section 33.
[0029]
Further, the current temperature from the temperature sensor 30 is compared with the lower limit temperature stored in the lower limit temperature storage unit 32. If the current temperature is lower than the lower limit temperature, a signal for continuing the power-on operation is transmitted to the power supply control unit 35 and the LED. The power is transmitted to the lighting unit 36, and the power is supplied by the power supply as usual, and the apparatus shown in FIG. 1 operates in the normal detection mode.
[0030]
In the operation in the normal detection mode, the current temperature detected by the temperature sensor 30 is compared with the lower limit temperature stored in the lower limit temperature storage unit 32, and the temperature detected by the temperature sensor 30 exceeds the lower limit temperature. When this happens, the determination unit 33 transmits a signal for causing the power supply control unit 35 to perform a standby operation. At this time, history information indicating that the temperature has become high is stored in the history storage unit 34.
[0031]
【The invention's effect】
As described above, according to the present invention, a history storage unit that stores information on whether a high-temperature state has been detected by a temperature sensor in the past is provided, and when the information that detected the high-temperature state is not stored in the history storage unit. When the power is turned on, a signal for starting the power supply is transmitted to the power control unit, and when information indicating that the high-temperature state is detected is stored in the history storage unit, the current temperature is higher than the lower limit temperature when the power is turned on. By transmitting a signal to control the power supply to determine whether or not the power supply to the power supply control unit, when the power is turned on, the device can be operated without being affected by the temperature of the outside air, When the temperature of the device rises to a high temperature state, the power supply operation can be stopped.
[Brief description of the drawings]
FIG. 1 is a block diagram of an image display device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the image display device. FIG. 3 is a perspective view showing a schematic configuration of a panel of the plasma display device. FIG. 5 is an explanatory view showing an electrode arrangement of a panel of the plasma display device. FIG. 5 is an exploded perspective view showing an internal arrangement structure of the plasma display device. FIG. 6 is a block diagram of a conventional video display device.
Reference Signs List 30 temperature sensor 31 temperature information input unit 32 lower limit temperature storage unit 33 judgment unit 34 history storage unit 35 power supply control unit 36 LED lighting unit

Claims (1)

A temperature information input unit to which a current temperature is input from a temperature sensor, a lower limit temperature storage unit that stores a lower limit temperature at which power is not supplied even when the power is turned on, and a current temperature and a lower limit temperature storage unit from the temperature information input unit. A judgment unit that compares the lower limit temperature stored in the unit and generates a signal indicating a high temperature state when the current temperature is higher, and turns on the power supply when a signal indicating the high temperature state is input from the judgment unit A power control unit that stops the operation, and a history storage unit that stores information as to whether or not a high-temperature state has been detected by a temperature sensor in the past, wherein the determination unit stores the information that detected the high-temperature state in the history storage unit. If not, a signal for starting power supply is transmitted to the power supply control unit when the power is turned on, and if information indicating detection of a high temperature state is stored in the history storage unit, the current temperature is turned on when the power is turned on. Lower limit temperature Video display apparatus characterized by being configured to transmit a signal for controlling the power energization to determine whether higher the power control unit.

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