KR100759434B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to optimize a driving state of a plasma display panel by applying different driving signals according to states of temperature to the plasma display panel. A plasma display panel displays images by using gas discharge. A sensing unit senses temperature of the plasma display panel. A chassis base is coupled with the plasma display panel in order to support the plasma display panel. A plurality of driving boards apply selectively driving signals to the plasma display panel according to a measured result of the temperature. The driving boards include an address buffer board corresponding to a lower side of the plasma display panel, and a scan driving board corresponding to a left side of the plasma display panel. The sensing boards are directed to a positioned direction of the address buffer board and a positioned direction of the scan driving board from a rear direction of the plasma display panel.

Description

Plasma display device {PLASMA DISPLAY DEVICE}

1 is a schematic exploded perspective view of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the division of the plasma display panel into nine zones in the rear direction.

3 is a graph showing a change in temperature of each position of the plasma display panel measured while changing the temperature of the chamber.

FIG. 4 is a graph showing a comparison of the average value of the temperature change measured by dividing the plasma display panel into nine zones and the temperature change of the zone c.

5 is a schematic perspective view illustrating an example in which a sensing unit is installed on a bottom surface of a scan driving board.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5.

7 is a view for explaining a positional relationship between a hole in the chassis base and a sensing unit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device which reduces vibrations of circuit elements provided on a substrate.

The plasma display apparatus is an apparatus which displays an image using the plasma produced | generated by gas discharge.

The plasma display device is mounted on a plasma display panel (hereinafter referred to as a PDP), a chassis base supporting the PDP, and an opposite side of the PDP of the chassis base, and connected to the PDP through a flexible printed circuit (FPC) and a connector. A plurality of driving boards connected to a display electrode or an address electrode positioned therein are provided.

PDP has weak mechanical properties against impact because it adheres two glass substrates face to face and forms a discharge space therein. In order to compensate for this, the chassis base combined with the PDP is composed of a material having high mechanical strength, for example, cast iron, to compensate for the mechanical rigidity of the PDP.

In addition, driving boards are mounted to the rear of the chassis base, and the driving boards are constructed by installing various kinds of circuit elements on a board for logic processing. The driving boards apply a high voltage driving signal to the display electrode or the address electrode to generate a discharge in the PDP.

On the other hand, since the PDP displays an image by gas discharge, a method of causing gas discharge using different drive signals according to the temperature state of the PDP has been proposed. For example, the temperature state of the PDP is divided into low temperature, room temperature, and high temperature state, and a driving signal that is slightly different according to the temperature state is applied to the PDP so as to enable optimal driving according to each state.

Therefore, in such driving, it is important to confirm the current temperature state of the PDP more than anything.

The present invention was developed in view of the above, and provides a plasma display device capable of checking an accurate temperature state of a PDP.

In order to achieve the above object, a plasma display apparatus provided by the present invention includes a plasma display panel displaying an image by gas discharge, a sensing unit sensing a temperature of the plasma display panel, and a chassis coupled to and supporting the plasma display panel. A base and driving boards for selectively applying a driving signal to the plasma display panel according to a temperature measurement result of the sensing unit, wherein the sensing unit is located at the bottom left in the rear direction when the plasma display panel is divided into nine zones. Correspondingly installed.

In this case, the driving board may be installed to face the chassis base on the rear surface to which the plasma display panel is coupled, and the sensing unit may be installed on the driving board.

The driving board may include a scan driving board generating a scan pulse and applying the scan pulse to a scan electrode of the plasma display panel, and the sensing unit may be installed on the scan driving board.

In addition, the sensing unit may be installed on the bottom surface of the scan driving board to face the chassis base.

In addition, the chassis base may face the sensing unit, and a hole may be formed to face the sensing unit with the plasma display panel, and the hole may have a larger size than the sensing unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a schematic exploded perspective view of a plasma display device according to an embodiment of the present invention.

Referring to this figure, the plasma display device of this embodiment includes a PDP 11 for displaying an image using gas discharge, a chassis base 17 attached to the rear surface of the PDP 11, and a chassis base 17 of the chassis base 17. As shown in FIG. And driving boards 15 mounted at the rear and electrically connected to the PDP 11 to apply a driving signal.

A heat dissipation sheet 13 and a double-sided tape (not shown) may be further interposed between the rear surface of the PDP 11 and the front surface of the chassis base 17.

The heat dissipation sheet 13 is interposed between the rear surface of the PDP 11 and the front surface of the chassis base 17 to electrically conduct and diffuse heat generated in the PDP 11 in the plane direction (x-y plane direction). The heat dissipation sheet 13 may be formed of an acrylic heat dissipation material having excellent thermal conductivity, a graphite heat dissipation material, a metal heat dissipation material, or a carbon nanotube heat dissipation material.

And, since the double-sided tape adheres the PDP 11 and the chassis base 17 to each other, the heat dissipation sheet 13 can be arranged in close contact with the rear surface of the PDP 11 and the front surface of the chassis base 17.

The PDP 11 includes a front substrate 111 and a rear substrate 211 and partitions a space therebetween to form discharge cells. This discharge cell forms a sub pixel which is the minimum unit for displaying an image. And along this discharge cell, an address electrode and a display electrode (pair of sustain electrode and a scan electrode) cross | intersect, and an image is displayed by the gas discharge of a discharge cell.

Meanwhile, the address electrode and the display electrode are electrically connected to the driving boards 15 so that the gas discharge of the discharge cell is controlled. The driving boards 15 selectively apply a driving signal to the address electrode and the display electrode according to the temperature state of the PDP 11 measured by the sensing unit 21 to control gas discharge of the discharge cell.

In addition, the driving boards 15 are composed of a substrate and circuit elements constituting a circuit on the substrate, and are fixed to the boss of the chassis base 17 with screws 19. The substrate 20 is generally composed of a printed circuit board (PCB) printed with a circuit pattern.

These drive boards 15 include an image processing / control board 115, an address buffer board 215, a scan drive board 315, a sustain drive board 415, and a power board 515 as functional blocks. .

The image processing / control board 115 receives an image signal from the outside to generate driving signals necessary for driving the address electrode and the display electrode, and thus the address buffer board 215 and the scan driving board 315 or the sustain driving board 415. ) Respectively.

The address buffer board 215 generates an address pulse and applies it to the address electrode, and the scan driving board 315 generates a scan pulse and applies it to the scan electrode. Accordingly, the PDP 11 sequentially determines the discharge cells that are turned on and the discharge cells that are not turned on in the address period.

The sustain driving board 415 generates a sustain pulse and applies it to the display electrode. Accordingly, the PDP 11 causes sustain discharge for the selected discharge cells in the address period. In general, the temperature measurement result of the sensing unit 21 is reflected in the sustain period to configure the sustain pulse differently according to the temperature, for example, it may be made in a manner of changing the pulse width according to the temperature.

The power board 515 supplies the power required for driving the plasma display device as a whole.

In addition, although not shown in the drawing, a front cabinet (not shown) is provided on the front side of the PDP 11 and a back cover (not shown) is provided on the rear side of the chassis base 17 to form an appearance of the plasma display apparatus.

Hereinafter, the position of the sensing part 21 which can confirm the temperature state of the PDP 11 correctly is demonstrated. 2 is a diagram illustrating a state in which the PDP is divided into nine zones in the rear direction.

Applicant partitioned the PDP 11 into 9 zones as shown in FIG. 2 and then tested the temperature change in each zone to find a position where the sensing unit 21 could ideally check the temperature of the PDP.

In FIG. 2, the PDP 11 is divided into nine zones from a to i based on the rear direction (the direction from the chassis base to the PDP based on the coordinates of FIG. 1). Here, a is located at the lower right and i is located at the upper left.

In the experiment, the RBI thermometer was installed in a 42-inch HD class PDP in each zone, and the combined PDP was placed in a chamber in the state shown in FIG. 1, and then the temperature of the chamber was changed from -5 ° C to 60 ° C. The change in temperature was measured while increasing to. As a result, the temperature change of each zone was as shown in the graph of FIG.

As a result of comparing the averaged temperatures of the nine identified zones with the temperatures of each zone, it was found that they were the most similar to the temperature of zone c. The graph of FIG. 4 shows the contrast of the temperature change in zone c and the average of zone 9 temperatures.

As can be seen from the above experiment, it can be seen that the sensing unit 21 is ideally installed at a position corresponding to the lower left corner when the PDP is uniformly divided into nine zones in the zone c, that is, in the rear direction. .

On the other hand, Figure 5 shows an embodiment in which the sensing unit 21 is installed corresponding to the zone c.

In FIG. 5, a dotted line is an imaginary line which divides the PDP 11 into 9 zones, and the left side is divided into c zone, f zone, and VII zone in the back direction.

On the other hand, the driving boards are installed via the boss 171 to face the rear surface 17a of the chassis base 17. Due to the height of the boss, the driving boards are spaced apart from the chassis base 17 by a predetermined distance.

In addition, in consideration of the wiring connection between the scan electrode and the sustain electrode of the PDP 11, the drive boards include the sustain drive board 415 on the right side and the scan drive board 315 on the left side.

Accordingly, the scan driving board 315 is located corresponding to the zone c, the zone f, and the zone VII, and the sensing unit 21 is preferably installed at the lower end of the scan driving board 21. In this case, the sensing unit 21 is installed on the bottom surface of the scan driving board 21 so as to face the PDP 11.

In addition, since the chassis base 17 is located between the PDP 11 and the sensing unit 21, the chassis base facing the sensing unit 21 so that the sensing unit 21 and the PDP 11 can directly face each other. It is preferable that the hole 173 is further formed on 17 (refer FIG. 6).

In this case, the hole 173 is preferably formed larger than the size of the sensing unit 21 as illustrated in FIG. In the form illustrated in FIG. 7, the diameter of the sensing unit 21 is smaller than the diameter of the hole 173.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display device according to the present invention, it is possible to accurately measure the temperature state of the PDP and apply a driving signal corresponding to the temperature state to the PDP.

Claims (6)

A plasma display panel which displays an image by gas discharge; A sensing unit configured to sense a temperature of the plasma display panel; A chassis base coupled to and supporting the plasma display panel; And, And driving boards for selectively applying a driving signal to the plasma display panel according to a temperature measurement result of the sensing unit. The drive boards, An address buffer board corresponding to a lower side with respect to an upper and lower direction of the plasma display panel; A scan driving board corresponding to a left side in a left and right direction of the plasma display panel; The sensing unit, In the rear direction of the plasma display panel, Biased toward the direction in which the address buffer board is located, And a plasma display device positioned to face the direction in which the scan driving board is located. The method of claim 1, The driving board is installed to face the chassis base on the rear surface to which the plasma display panel is coupled. And the sensing unit is installed on the driving board. The method of claim 2, The scan driving board generates a scan pulse and applies the scan pulse to the scan electrode of the plasma display panel. The sensing unit is disposed on the scan driving board. The method of claim 3,  The sensing unit is installed on the bottom surface of the scan drive board facing the chassis base. The method according to any one of claims 1 to 4, And the chassis base is opposite to the sensing unit and has a hole formed to face the sensing unit to the plasma display panel. The method of claim 5, And the hole has a size larger than that of the sensing unit.

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