KR20050028144A - Structure of plasma display panel - Google Patents

Abstract

A structure of a plasma display panel is provided to reduce electromagnetic interference noises and achieve improved quality of screen, by enhancing the return current path of sustain pulses in a Y scan board. A structure of a plasma display panel comprises an upper substrate constituted by an Y scan board(20) and an Y sustain board(40) arranged in parallel with each other; a lower metal plate arranged beneath and in parallel with the upper substrate; a vertical printed circuit board support(11) connected to the Y scan board of the upper substrate and the lower metal plate in a vertical direction and fixed at the lower metal plate; an Y electrode(42) arranged at a lower surface of the lower metal plate; and a flexible printed circuit cable for connecting the Y scan board and the Y electrode. The Y scan board includes a ground structure connected to a grounding such that the return current of the sustain signal current for driving the plasma display panel passes.

Description

Structure of Plasma Display Panel {Structure of Plasma Display Panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plasma display panel (PDP), which is a flat panel display device. In particular, an electromagnetic interference (EMI) reduction ground of a PDP characterized by improving a return current path of a sustain pulse in a Y scan board. It's about structure.

In the 21st century, information and electronics technology will be further accelerated and developed by ultra high-speed information and communication technology and computers, and the key element technology supporting this is high value-added semiconductor and display technology.

Until now, the concept of display has been focused on the limited area of CRT (cathode-ray tube) univariate.However, with the development of the information society, the amount of information that humans can access is enormous and various types of information carriers. The concept of multimedia is emerging as an integrated concept. In this multimedia era, the importance of display is that most information is delivered through human visual functions and the use environment of the device is diversified.

For example, in the case of a device used in an environment where mobility is emphasized, such as a personal portable device, an automobile, an aircraft, and the like, light and small and low power consumption may be important factors, and when used as an information transmission medium for the public, a wide viewing angle is used. Display characteristics of a large screen are required. Representative items such as flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), etc. Among these, CRTs have CRTs due to low cost and large size using thick film technology. Next generation display to replace the most in the spotlight.

The PDP has an advantage of being easier to manufacture due to the characteristics of the manufacturing process than other display elements in implementing high definition television (HDTV) of 40 Hz or more, and is widely used for wall-mounted TVs, home theater displays, and various monitors. Is being applied.

In general, PDPs are classified into indirect discharge type (hereinafter referred to as AC PDP) and direct discharge type (hereinafter referred to as DC PDP) according to the type of driving voltage applied to the discharge cell. The AC PDP is driven by a sinusoidal AC voltage or a pulsed voltage and the electrode is covered with a dielectric, whereas the DC PDP is exposed to the discharge space as it is, so that the discharge current flows while the discharge voltage is applied.

As shown in the plan view of FIG. 1, the PDP includes the Y scan board 20, the Y sustain board 40, the X board 90, the Z sustain board 70, the control board 100, and the power board 110. 1, the Y electrodes 42 and the Z electrodes 47 are alternately arranged to be perpendicular to the X electrodes 48, as shown in FIG. 3.

Here, the power from the power board 110 drives the X board 90 by the control board 100, the Y sustain board 40, Y scan board 20, Z sustain board 70 The high and low sustain pulse waveforms are alternately sent to the Y electrode 42 and the Z electrode 47 through the N / W to drive and discharge the PDP panel.

At this time, a displacement current is formed between the Y electrode 42 and the Z electrode 47, and as a result, a signal flow is formed between the Y electrode 42 and the Z electrode 47 as shown in the solid line of FIG. 4. Will be. In addition, the signal current forms a return current as shown by the dotted line in FIG. 4 due to the ground of the metal plate ground, and the return current of the signal current always flows in search of a path having a minimum impedance.

However, the problem with the existing system is that on the Z sustain board 70, as shown in Figure 1 there is a ground point 60 between the Z sustain board 70 and the metal plate and also the ground point 60 is shown in Figure 4 The closed loop for the return signal is formed as small as possible near the sustain output signal. However, in the case of the Y side, the Y scan board 20 is placed on the return current path for the Y sustain pulse directed toward the Y electrode 42. As shown in FIG. 1, there is a ground point 50 between the Y sustain board 40 and the metal plate, but there is no ground point with the metal plate on the Y scan board 20 as shown in FIG. 5.

  Therefore, the output Y sustain pulse signal is to be recovered again through any signal path, and the return current signal is returned to find the signal path having the minimum impedance. The current return signal of does not go to the Y scan board 20 through the Y scan board 20 and the non-grounded Y scan printed circuit board support 11, but instead goes to the grounded Y sustain board 40 and returns. Done.

In addition, since the electromagnetic radiation (EMI) radiation amount is proportional to the area of the closed curve formed by the output signal and the return current path, the smaller the area produced by the closed curve, the smaller the amount of electromagnetic interference (EMI) radiation appears. In the existing structure, voltage difference is generated at both parts disconnected to form this closed curve, which acts as one antenna, and the electromagnetic radiation is increased, which generates electromagnetic noise. There is a problem to drop.

The present invention has been made to solve the above problems, the object of which is to improve the return current path of the sustain pulse in the Y scan board of the PDP to reduce the electromagnetic interference (EMI) noise in the PDP to improve the image quality To provide.

In order to achieve the above object, the present invention provides a grounding point between a top layer of a Y scan board of a PDP and a vertical printed circuit board support to reduce an area formed by a return current path of a sustain pulse in the Y scan board. By lowering the PDP quality can be improved.

Plasma display panel structure of the present invention for realizing the above object is an upper substrate consisting of a parallel Y scan board and a Y sustain board, a lower metal plate parallel to the upper substrate and located on the bottom surface, and the Y scan board of the upper substrate A vertical printed circuit board support vertically connected to the lower metal plate and fixed to the lower metal plate, and a Y electrode positioned parallel to a bottom surface of the lower metal plate; In the PDP structure including a fusible printed circuit cable (FPC cable) connecting the Y scan board and the Y electrode,

 The Y scan board is characterized in that it comprises a ground structure connected to the ground so that the return current of the sustain signal current for driving the PDP.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Electromagnetic interference (EMI) reduced grounding structure of the plasma display panel according to the present invention is the upper substrate consisting of the Y scan board 10 and the Y sustain board 40 in parallel with each other, as shown in Figs. A vertical printed circuit board vertically connected to the lower metal plate 41 parallel to the substrate and positioned at the bottom, and vertically connected to the Y scan board 20 and the lower metal plate 41 of the upper substrate, respectively, and fixed to the lower metal plate 41. A soluble printed circuit cable (FPC cable 10) connecting the support 11, the Y electrode 42 positioned in parallel to the bottom surface of the lower metal plate 41, and the Y scan board 20 and the Y electrode. It is configured to include.

Here, the Y scan board 20 having a ground layer inserted therein and the lower metal plate 41 grounded are connected to the vertical printed circuit board support 11 and the Y scan board 20 The return current of the sustain pulse is via the vertical printed circuit board support 11 directly grounded.

 Such a structure can reduce the area formed by the return current path of the sustain pulse in the Y scan board 20 as compared with the prior art.

   In addition, the Y scan board 20 and the Y electrode 42 are brought into close contact with each other by a soluble FPC cable 10 to form a return current path of the sustain pulse in the Y scan board 20. Reduce the area

This is because the amount of electromagnetic interference (EMI) radiation is proportional to the area of the closed curve created by the output signal and the return current path, so the smaller the area produced by this closed curve, the smaller the amount of EMI generated.

This is a structure in which the ground current does not exist in the Y scan board 20 so that the return current path of the sustain pulse is interrupted in an overall aspect as shown in FIG. 5, but the present invention is shown in FIG. 7. As described above, by processing the top of the Y scan board 20 with the vertical printed circuit board support 11 ′ connected to the grounded metal plate, a return current always flows in search of a path having a minimum impedance, so that the Y scan board 20 The return current of the sustain pulse at is passed through the vertical printed circuit board support 11 'which is immediately grounded to reduce the closed curve area of the return current, thereby improving electromagnetic interference (EMI).

That is, as shown in FIG. 8, according to the improved structure according to the present invention of the solid line, unlike the existing structure by the dotted line, it is possible to innovatively reduce the EMI noise in the low frequency band caused by the return current of the sustain pulse. have.

As a result, the problem that the electromagnetic energy generated by the electromagnetic noise degrades the performance efficiency of the device may be improved, thereby providing a clearer picture quality, which is an advantage of the PDP display.

Referring to the operation of the electromagnetic interference (EMI) reduction ground structure of the PDP of the present invention configured as described above are as follows.

As shown in FIG. 3, the Y electrode 42 and the Z electrode 47 which are alternately side by side are arranged perpendicularly to the X electrode 48, and the power of the power board 110 is controlled by the control board. The X board 90 is driven by 100, and the Y electrode 42 and the Z electrode are provided through the Y sustain board 40, the Y scan board 20, and the Z sustain board 70. The high and low sustain pulse waveforms are alternately sent to (47) to continue charging and discharging to drive the PDP panel.

At this time, a displacement current is formed between the Y electrode 42 and the Z electrode 47, and as a result, the flow of the sustain signal current is shown between the Y electrode 42 and the Z electrode 47 as shown in the solid line of FIG. 4. Will be formed.

 In addition, the signal current forms a return current as shown by the dotted line in FIG. 4 due to the ground of the metal plate ground. As the return current of the signal current always flows in search of a path having a minimum impedance, it is shown in FIG. As shown in FIG. 6, when the ground processing is not performed between the Y scan board 20 and the vertical printed circuit board support 11, the return current is grounded without passing through the Y scan board 20. Jumped directly to the ground point 50 between the Y sustain board 40 and the metal plate, but in the improved structure according to the present invention, as shown in FIG. 7, the top of the Y scan board 20 and the vertical printed circuit support ( 11 ') allows the return current to go through the Y scan board 20 as shown in FIG.

The above configuration reduces the closed curve area of the return current path.

In addition, the Y scan board 20 and the Y electrode 42 are brought into close contact with each other by the soluble FPC cable 10 so that the return current path of the sustain pulse in the Y scan board 20 is reduced. Reduce the area to be formed.

In other words, the amount of electromagnetic interference (EMI) radiation is proportional to the area of the closed curve created by the output signal and the return current path, and thus, the amount of electromagnetic interference (EMI) emitted by reducing the area generated by the closed curve is drastically reduced.

As described above, the PDP structure according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Of course it can.

       The PDP structure according to the present invention configured as described above reduces the area of the closed curve formed by the return current path by allowing the return current to go through the Y scan board by grounding the upper surface of the Y scan board and the vertical printed circuit support. By connecting the Y scan board and the Y electrode in close contact with a fusible FPC cable to the Y board, the area formed by the return current path of the sustain pulse on the Y scan board is reduced, thereby reducing the return current of the sustain pulse. Innovatively reduces EMI noise caused by low frequency bands and improves the problem that the electromagnetic energy generated by electromagnetic noise degrades the performance efficiency of the device. It has the advantage of sharpening.

1 is a plan view showing the internal structure of the PDP,

Figure 2 is a side view showing the internal structure of the Y substrate of the PDP,

3 is a signal flow diagram of a PDP;

4 is a flowchart of a sustain signal and a return signal of a conventional PDP;

5 is a plan view and a side view illustrating a connection structure between a Y scan board and a vertical printed circuit board support of a conventional PDP;

6 is a return current path of a sustain pulse in a Y scan board according to a conventional structure;

7 is a plan view and a side view showing a connection structure between a Y scan board and a vertical printed circuit board support of the PDP of the present invention;

8 is a graph comparing electromagnetic interference (EMI) in the low frequency band according to the conventional structure and the improved structure according to the present invention;

9 is a return current path of the sustain pulse in the Y scan board according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Y fusible printed circuit cable 11: Vertical printed circuit board support

20: Y scan board 30: Y sustain board connection connector

40: Y sustain board 41: metal plate

42 Y electrode 43 Screen filter

44: aluminum frame 45: plastic frame

46: internal metal frame 47: Z electrode

48: X electrode 50: Ground point of Y sustain board and metal plate

60: Grounding point between Z sustain board and metal plate 70: Z sustain printed circuit board

80: back board metal plate 90: X board

100: control board 110: power board

Claims (3)

An upper substrate composed of parallel Y scan boards and Y sustain boards; A lower metal plate parallel to the upper substrate and positioned on a bottom surface thereof; A vertical printed circuit board support vertically connected to the Y scan board and the lower metal plate of the upper substrate and fixed to the lower metal plate; A Y electrode positioned parallel to the bottom of the lower metal plate; In the PDP structure including a fusible printed circuit cable (FPC cable) connecting the Y scan board and the Y electrode,  The Y scan board is configured to include a ground structure connected to the ground so that the return current of the sustain signal current for driving the PDP structure. The method of claim 1, And wherein the grounding structure comprises a vertical printed circuit board support connected to the grounded lower metal plate and a top plate of the Y scan board connected to the vertical printed circuit board support. The method of claim 1, And the soluble printed circuit cable (FPC cable) is closely connected to the Y board so that the path of the return current is shortened.