JP4360063B2 - Video display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a video display device such as a plasma display device known as a thin, lightweight display device having a large screen.
[0002]
[Prior art]
In this plasma display device, an ultraviolet ray is generated by gas discharge, and a phosphor is excited by the ultraviolet ray to emit light to perform color display. And the display cell divided by the partition on the board | substrate is provided, and it has the structure by which the fluorescent substance layer is formed in this.
[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, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, the mainstream of plasma display devices is a surface discharge type of a three-electrode structure, and the structure has a pair of display electrodes adjacent in parallel on one substrate, and on the other substrate. It has an address electrode arranged in a direction intersecting with the display electrode, a partition wall, and a phosphor layer. The phosphor layer can be made relatively thick and is suitable for color display using a phosphor.
[0004]
Such a plasma display device can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to enlarge, and is self-luminous so that the display quality is high. Recently, the flat panel display has attracted particular attention and is used for various purposes as a display device in a place where many people gather and a display device for enjoying a large screen image 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 stripe-shaped display electrodes 2 paired with a scan electrode and a sustain electrode are formed on a transparent front side substrate 1 such as a glass substrate, and covers the electrode group. Thus, the dielectric layer 3 is formed, and the protective film 4 is formed on the dielectric layer 3.
[0007]
Further, a plurality of rows of stripes covered with an overcoat layer 6 are formed on the rear substrate 5 opposite to the front substrate 1 so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. Address electrodes 7 are formed. On the overcoat layer 6 between the address electrodes 7, a plurality of barrier ribs 8 are arranged in parallel with the address electrodes 7, and a phosphor layer 9 is provided on the side surface between the barrier ribs 8 and on the surface of the overcoat layer 6. Yes.
[0008]
The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrode 2 and the address electrode 7 of the scan electrode and the sustain electrode are almost orthogonal to each other, and the periphery is sealed, In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. Further, the discharge space is divided into a plurality of sections by partition walls 8 to provide a plurality of discharge cells where the intersections of the display electrodes 2 and the address electrodes 7 are located, and each of the discharge cells has red, green and blue colors. The phosphor layers 9 are sequentially arranged one by one so that
[0009]
FIG. 4 shows an electrode arrangement of the plasma display panel. As shown in FIG. 4, the scan electrode, the sustain electrode, and the address electrode have a matrix configuration of M rows × N columns, and M rows are arranged 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 pulse is applied between the address electrode and the scan electrode by applying a write pulse between the address electrode and the scan electrode, and after selecting the discharge cell, the scan electrode By applying a periodic sustain pulse that is alternately inverted between the sustain electrode and the sustain electrode, a sustain discharge is performed between the scan electrode and the sustain electrode, and a predetermined display is performed.
[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 figure, a housing for housing the panel 10 is composed of a front frame 11 and a metal back cover 12, and an opening of the front frame 11 is made of a glass or the like that also serves as an optical filter and panel 10 protection. A cover 13 is arranged. Further, the front cover 13 is subjected to, for example, silver vapor deposition in order 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 adhering to the front surface of a chassis member 14 made of aluminum or the like via a heat conductive sheet 15, and a plurality of circuits for driving the panel 10 on the rear surface side of the chassis member 14. A block 16 is attached. The heat conductive sheet 15 is for efficiently transferring the heat generated in the panel 10 to the chassis member 14 to radiate heat. Further, the circuit block 16 includes an electric circuit for performing display driving of the panel 10 and its control, and the electrode lead-out portion led out to the edge portion of the panel 10 extends beyond the four edge portions of the chassis member 14. They are electrically connected by a plurality of extending flexible wiring boards (not shown).
[0013]
Further, a boss portion 14a for attaching the circuit block 16 or fixing the back cover 12 is protruded from 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, since the temperature of the panel becomes high due to the discharge in the panel, as described above, the heat of the panel is transferred to the chassis member to dissipate the heat, and the display drive disposed on the rear side of the chassis member The temperature of the circuit block is increased due to the heat generated by the operation of the circuit block. For this reason, a temperature sensor is disposed in the vicinity of the circuit block, and energization of the power supply is controlled before the apparatus enters an abnormal operation state.
[0015]
FIG. 6 shows a block diagram of a conventional control unit, in which 20 is a temperature sensor disposed in the vicinity of the circuit block on the back side of the plasma display device, and 21 is a current temperature from the temperature sensor 20. An input temperature information input unit 22 is a lower limit temperature storage unit that stores a lower limit temperature that is not energized even when the power switch is turned on, and 23 is stored in the current temperature and lower limit temperature storage unit 22 detected by the temperature sensor 20. The determination unit 24 compares the lower limit temperature and generates a signal of a high temperature state when the current temperature is higher, and 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 the operating state of the power supply so that the user can recognize it.
[0016]
The operation of the conventional apparatus configured as described above will be described. First, in a factory or the like, a lower limit temperature value that does not energize even when the power switch is turned on when the power is turned on is stored in the lower limit temperature storage unit 22. To ship.
[0017]
When the user performs an operation of turning on the power switch to perform the power-on operation, the 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 if the current temperature is higher, a signal indicating a high temperature state is sent to the power supply control unit 24 and the LED lighting unit. 25.
[0018]
In the power supply control unit 24, the power-on operation is performed by the user, but an operation (standby operation) in which the power-on operation is not performed is performed based on the high-temperature state detection information from the determination unit 23. In addition, the LED lighting unit 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 unit 23.
[0019]
[Problems to be solved by the invention]
However, in the conventional configuration described above, even when the outside air temperature is higher than the lower limit temperature, it is not performed the power-on operation, even when using the first example by installing a plasma display device routinely temperatures higher regions Even though the apparatus is not in an abnormal state, there is a problem that even if the power switch is turned on, the power supply is not energized. For this reason, although it is a product that operates normally as a device, it has been misunderstood by the user that it 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 an object of the present invention is to provide an image display device that can be used with peace of mind by a user when the temperature of the device is detected by a temperature sensor to control energization by a power source. To do.
[0021]
[Means for Solving the Problems]
In order to achieve this object, the video display device of the present invention includes a history storage unit that stores information on whether or not a high temperature state has been detected by a temperature sensor in the past, and the history storage unit stores information on detection of a high temperature state. If it is not stored, a signal to start energization of the power supply when the power is turned on regardless of the current temperature is transmitted to the power supply control unit, and information that detects the high temperature state is stored in the history storage unit Is configured to determine whether or not the current temperature is higher than the lower limit temperature when the power is turned on, and to transmit a signal for controlling energization of the power source to the power source control unit.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
That is, the invention according to claim 1 of the present invention is a temperature sensor that is disposed in the vicinity of the circuit block of the apparatus and detects the temperature in the vicinity of the circuit block, and temperature information in which the current temperature is input from the temperature sensor. The input unit, a lower limit temperature storage unit that stores a lower limit temperature that is not energized even when the power is turned on, and a current temperature from the temperature information input unit and a lower limit temperature stored in the lower limit temperature storage unit are compared. A determination unit that generates a signal indicating a high temperature state when the current temperature is higher, a power control unit that stops energization of a power source when a signal indicating a high temperature state is input from the determination unit, and a temperature sensor in the past by a history storage unit for storing information on whether it detects a high temperature state, and compares the lower limit temperature stored in the lower limit temperature storage unit the current temperature and detected by the temperature sensor, the When the value by the degree sensor becomes a high temperature state exceeding the value of the lower limit temperature, the determination unit transmits a signal for causing the power supply control unit to perform a standby operation, and the history storage unit is in a high temperature state. A video display device configured to perform an operation in a normal detection mode for storing history information, wherein the determination unit is configured to store the temperature information when information indicating a high temperature state is not stored in the history storage unit. Regardless of the signal from the input unit, when the power is turned on, a signal for starting energization of the power source is transmitted to the power source control unit, and then the operation in the normal detection mode is performed. If stored, if it is determined that the current temperature from the temperature information input unit is higher than the lower limit temperature stored in the lower limit temperature storage unit when the power is turned on, the standby operation is performed. When the signal is transmitted to the power supply control unit, and when it is determined that the current temperature from the temperature information input unit is lower than the lower limit temperature stored in the lower limit temperature storage unit, a signal for starting energization of the power supply is transmitted. After the transmission , the device is configured to operate in the normal detection mode , and when the power is turned on for the first time after the device is installed, the device can be operated without being influenced by the temperature of the outside air. In addition, when the temperature of the apparatus rises to a high temperature state, the power supply operation can be stopped.
[0023]
A video display device according to an embodiment of the present invention will be described below with reference to FIGS.
[0024]
FIG. 1 is a block diagram of a video display apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation flow thereof. First, in FIG. 1, 30 is a temperature sensor that is disposed in the vicinity of the circuit block on the back side of the plasma display device and detects the temperature in the vicinity of the circuit block, and 31 is temperature information to which the current temperature from the temperature sensor 30 is input. An input unit 32 is a lower limit temperature storage unit that stores a lower limit temperature that is not energized even when the power switch is turned on, and 33 is a current temperature detected by the temperature sensor 30 and a lower limit temperature stored in the lower limit temperature storage unit 32. In comparison, a determination unit that generates a signal of a high temperature state when the current temperature is higher, 34 is 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 35 is a determination unit 33. In response to the signal indicating the high temperature state from the power source, the power source control unit stops the energization of the power source. If not, a signal for starting energization of the power supply is transmitted to the power supply control unit 35 when the power is turned on. On the other hand, if the history storage unit 34 stores the information indicating the high temperature state, It is determined whether the temperature is higher than the lower limit temperature, and a signal for controlling energization of the power source is transmitted to the power source control unit 35. Reference numeral 36 denotes an LED lighting unit for displaying the operating state of the power source so that the user can recognize it.
[0025]
Next, the operation of the video display device configured as described above will be described. First, in a factory or the like, the lower limit temperature value that does not energize even when the power switch is turned on when the power is turned on is set as the lower limit temperature storage unit. Stored in 32 and shipped.
[0026]
When the user performs an operation of turning on the power switch to perform the power-on operation, the 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 information to the determination unit 33 as to whether or not a high temperature state has been detected by the temperature sensor 30 before the power is turned on.
[0027]
In the determination unit 33, when there is no history in which the information indicating the high temperature state is not stored in the history storage unit 34, the current temperature from the temperature sensor 30 and the lower limit temperature storage unit 32 are stored as shown in FIG. A certain lower limit temperature is compared, and a signal for continuing the power-on operation of power-on even if the current temperature is high is transmitted to the power-supply control unit 35 and the LED lighting unit 36 to operate the apparatus. In other words, if the history storage unit 34 does not store information that detects a high temperature state, a signal for starting energization of the power supply when the power is turned on is transmitted to the power supply control unit 35 regardless of the signal from the temperature information input unit 31. And operate the device in normal detection mode.
[0028]
On the other hand, if there is a history in which information indicating a high temperature state is stored in the history storage unit 34, it is determined whether 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 that does not energize the power supply is transmitted to the power supply control unit 35 and the LED lighting unit 36, and the power supply control unit 35 performs a power-on operation by the user. An operation that does not perform power-on (standby operation) is performed based on detection information of a high temperature state. Further, the LED lighting unit 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 unit 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. When the current temperature is lower than the lower limit temperature, a signal for continuing the power-on operation is sent to the power supply control unit 35 and the LED. The light is transmitted to the lighting unit 36 and energized by the power source 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 high temperature state in which the value by the temperature sensor 30 exceeds the value of the lower limit temperature. In such a case, 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 history storage unit 34 has reached a high temperature state is stored.
[0031]
【The invention's effect】
As described above, according to the present invention, there is provided a history storage unit that stores information on whether or not a high temperature state has been detected by a temperature sensor in the past, and information that detects a high temperature state is not stored in the history storage unit. Transmits a signal for starting energization of the power supply when the power is turned on regardless of the current temperature to the power supply control unit, and if the history storage unit stores information indicating a high temperature state, the current temperature is By determining whether or not the temperature is higher than the lower limit temperature and sending a signal to control the power supply to the power supply control unit, the device is installed and the power is turned on for the first time. The device can be operated without any trouble, and 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 an operation of the image display device. FIG. 3 is a perspective view showing a schematic configuration of a panel of a plasma display device. FIG. 5 is an exploded perspective view showing the internal arrangement structure of the plasma display device. FIG. 6 is a block diagram of a conventional video display device.
30 Temperature Sensor 31 Temperature Information Input Unit 32 Lower Limit Temperature Storage Unit 33 Determination Unit 34 History Storage Unit 35 Power Supply Control Unit 36 LED Lighting Unit

Claims (1)

A temperature sensor disposed near the circuit block of the apparatus for detecting the temperature near the circuit block, a temperature information input unit to which the current temperature is input from the temperature sensor, and energization is not performed even when the power is turned on. A lower limit temperature storage unit for storing a lower limit temperature, a signal indicating a high temperature state when the current temperature is higher by comparing the current temperature from the temperature information input unit and the lower limit temperature stored in the lower limit temperature storage unit A history that stores information on whether a high-temperature state has been detected by a temperature sensor in the past, a power-supply control unit that stops energization of a power source when a signal indicating a high-temperature state is input from the determination unit and a storage unit, and the comparison between the lower limit temperature stored in the lower limit temperature storage unit the current temperature and detected by the temperature sensor, a high value by the temperature sensor exceeds the value of the lower limit temperature In this state, the determination unit transmits a signal for causing the power supply control unit to perform a standby operation, and performs operation in a normal detection mode for storing history information indicating that the history storage unit has reached a high temperature state. In the video display device configured to perform the determination, the determination unit is configured to turn on the power when the power is turned on regardless of the signal from the temperature information input unit when the history storage unit does not store the information indicating the high temperature state. After the signal for starting energization of the power is transmitted to the power control unit, the operation in the normal detection mode is performed. On the other hand, when the information indicating the detection of the high temperature state is stored in the history storage unit, When it is determined that the current temperature from the input unit is higher than the lower limit temperature stored in the lower limit temperature storage unit, a signal for performing a standby operation is transmitted to the power supply control unit, and When it is determined that the current temperature from the degree information input unit is lower than the lower limit temperature stored in the lower limit temperature storage unit, a signal to start energization of the power source is transmitted to the power source control unit, and then the operation in the normal detection mode An image display device configured to perform

Images