KR20090126885A - Plasma display device thereof - Google Patents

Abstract

PURPOSE: A plasma display device thereof is provided to improve the stability of the panel and driver circuit by shielding the noise and the electromagnetic wave generating in the panel drive. CONSTITUTION: The plasma display panel(100) is formed a plurality of electrodes. The driving part generates the driving signal provided to a plurality of electrodes. The driving signal feed port supplies the driving signal which becomes to a plurality of electrodes. The backcover(120) protects the back side of the panel. The frame comprises the frame(110) in which the driving signal feed port is arranged while locating between the panel and backcover.

Description

Plasma display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and more particularly, to a driving apparatus of a plasma display panel for supplying driving signals to electrodes for driving a panel.

The plasma display apparatus includes a panel in which a plurality of discharge cells are formed between a rear substrate having a partition wall and a front substrate opposite thereto, and is selectively generated by discharge of the plurality of discharge cells according to an input image signal. A device for displaying an image by causing vacuum ultraviolet rays to emit phosphors.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and more particularly, to a driving apparatus of a plasma display panel for supplying driving signals to electrodes for driving a panel.

In general, a plasma display panel generates a discharge by applying a predetermined voltage to electrodes provided in a discharge space, and plasma generated during gas discharge excites a phosphor, thereby displaying an image including a character or a graphic. It is advantageous in that it is easy to thin a plane, provides a wide viewing angle up and down, left and right, and realizes full color and high brightness.

The plasma display apparatus includes a driving circuit for generating signals for driving the panel, and there is a problem in that noise or electromagnetic waves are generated when driving the panel using the driving circuit.

An object of the present invention is to provide a plasma display apparatus capable of improving the stability of driving circuits for supplying a driving signal to a plasma display panel.

Plasma display device according to the present invention for solving the above technical problem, plasma display panel formed with a plurality of electrodes; A driving unit generating a driving signal supplied to the plurality of electrodes; A driving signal supply unit supplying the generated driving signal to the plurality of electrodes; A back cover surrounding the rear of the panel; And a frame positioned between the panel and the back cover and having the drive signal supply unit disposed therein, wherein a groove is formed on one surface of the back cover in a convex direction toward the panel, and the drive unit is disposed in the groove. do.

According to the plasma display device according to the present invention configured as described above, by placing a panel driving circuit in the groove formed in the back cover can shield the noise and electromagnetic waves generated when the panel is driven, the panel and the driving circuit to the back cover By separating between them, malfunction of a panel or a drive circuit can be prevented.

Hereinafter, a plasma display device according to the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view illustrating an embodiment of a structure of a plasma display panel.

As shown in FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and the bus electrodes 11b and 12b. 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). . The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed and thus not physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, the lower dielectric layer 23 and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

FIG. 2 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 2. The plurality of discharge cells are provided at the intersections of the scan electrode lines Y1 to Ym, the sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zm may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines, or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned is possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down or left and right in the center portion of the panel.

3 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8 and a sustain section S1, ..., S8.

Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, a display data signal is applied to the address electrode X, and scan pulses corresponding to each scan electrode Y are sequentially applied.

In each of the sustain periods S1, ..., S8, a sustain pulse is alternately applied to the scan electrode Y and the sustain electrode Z to form wall charges in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gradations, each subfield in turn has different sustains at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of pulses can be assigned. In order to obtain luminance of 133 gradations, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields, such as 12 or 16 subfields.

The number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

4 is a timing diagram illustrating an embodiment of a drive signal for driving a plasma display panel.

The subfield is a wall formed by a pre-reset section and a pre-reset section for forming positive wall charges on the scan electrodes Y and negative wall charges on the sustain electrodes Z. It may include a reset section for initializing the discharge cells of the entire screen by using the charge distribution, an address section for selecting the discharge cells, and a sustain section for maintaining the discharge of the selected discharge cells. have.

The reset section includes a setup section and a setdown section. In the setup section, rising ramp waveforms (Ramp-up) are simultaneously applied to all scan electrodes to generate fine discharges in all discharge cells. Thus, wall charges are generated. In the set-down period, a falling ramp waveform (Ramp-down) falling at a positive voltage lower than the peak voltage of the rising ramp waveform (Ramp-up) is simultaneously applied to all the scan electrodes (Y), thereby eliminating discharge discharge in all the discharge cells. Generated, thereby eliminating unnecessary charges during wall charges and space charges generated by the setup discharges.

In the address period, a scan signal having a negative scan voltage Vsc is sequentially applied to the scan electrode, and at the same time, a positive data signal is applied to the address electrode X. The address discharge is generated by the voltage difference between the scan signal and the data signal and the wall voltage generated during the reset period, thereby selecting the cell. On the other hand, in order to increase the efficiency of the address discharge, a sustain bias voltage Vzb is applied to the sustain electrode during the address period.

During the address period, the plurality of scan electrodes Y may be divided into two or more groups, and scan signals may be sequentially supplied to each group, and each of the divided groups may be further divided into two or more subgroups and sequentially by the subgroups. Scan signals can be supplied. For example, the plurality of scan electrodes Y is divided into a first group and a second group, and scan signals are sequentially supplied to scan electrodes belonging to the first group, and then scan electrodes belonging to the second group Scan signals may be supplied sequentially.

According to an embodiment of the present invention, the plurality of scan electrodes Y may be divided into a first group located at an even number and a second group located at an odd number according to a position formed on a panel. In another embodiment, the panel may be divided into a first group positioned above and a second group positioned below the center of the panel.

The scan electrodes belonging to the first group divided by the above method are further divided into a first subgroup located at an even number and a second subgroup located at an odd number, or the first group. The first subgroup positioned above and the second group positioned below may be divided based on the center of the.

In the sustain period, a sustain pulse having a sustain voltage Vs is alternately applied to the scan electrode and the sustain electrode to generate sustain discharge in the form of surface discharge between the scan electrode and the sustain electrode.

The width of the first sustain signal or the last sustain signal among the plurality of sustain signals alternately supplied to the scan electrode and the sustain electrode in the sustain period may be greater than the width of the remaining sustain pulses.

After the sustain discharge occurs, an erase period for erasing the wall charge remaining in the scan electrode or the sustain electrode of the selected ON cell in the address period by generating a weak discharge may be further included after the sustain period.

The erase period may be included in all or some of the plurality of subfields, and the erase signal for the weak discharge is preferably applied to the electrode to which the last sustain pulse is not applied in the sustain period.

The cancellation signal is a ramp-type signal that gradually increases, a low-voltage wide pulse, a high-voltage narrow pulse, an exponential signal, or half Sinusoidal pulses can be used.

In addition, a plurality of pulses may be sequentially applied to the scan electrode or the sustain electrode to generate the weak discharge.

The driving waveforms shown in FIG. 4 are exemplary embodiments of signals for driving the plasma display panel according to the present invention, and the present invention is not limited to the waveforms shown in FIG. 4. For example, the pre-reset period may be omitted, and the polarity and the voltage level of the driving signals illustrated in FIG. 4 may be changed as necessary. After the sustain discharge is completed, an erase signal for erasing wall charge may be applied to the sustain electrode. May be authorized. In addition, the single sustain driving may be performed by applying the sustain signal to only one of the scan electrode (Y) and the sustain (Z) electrode to generate a sustain discharge.

FIG. 5 illustrates an embodiment of a configuration of a driving apparatus for driving a plasma display panel.

Referring to FIG. 5, the heat dissipation frame 30 is installed on the rear surface of the panel to support the panel and to absorb and release heat generated from the panel. In addition, a printed circuit board (PCB) for applying driving signals to the panel is provided on the rear surface of the heat dissipation frame 30.

On the PCB, an address driver 50 for supplying a drive signal to address electrodes of a panel, a scan driver 60 for supplying a drive signal to scan electrodes of a panel, and a drive for sustain electrodes of a panel A sustain driver 70 for supplying a signal, a drive controller 80 for controlling the drive circuits, and a power supply unit PSU 90 for supplying power to each drive circuit may be disposed.

The address driver 50 supplies a drive signal to the address electrodes formed on the panel so that only the discharge cells discharged from among the plurality of discharge cells formed on the panel are selected.

The address driver 50 may be installed on any one or both of the upper and lower sides of the panel according to a single scan method or a dual scan method.

In the address driver 50, a data IC (not shown) is installed to control a current applied to the address electrode. In the data IC, a switching is generated to control an applied current so that a large amount of heat may be generated. Therefore, a heat sink (not shown) may be installed in the address driver 50 to eliminate heat generated in the control process.

As illustrated in FIG. 5, the scan driver 60 may include a scan sustain board 62 connected to the driving controller 80, and a scan driver board 64 connecting the scan sustain board 62 to a panel. have.

The scan driver board 64 may be divided into two parts, an upper side and a lower side. Unlike the illustrated in FIG. 5, one scan driver board 64 may be installed as one or a plurality of scan driver boards 64.

The scan driver board 64 is provided with a scan IC 65 for supplying a drive signal to the scan electrodes of the panel, and the scan IC 65 can continuously apply reset, scan and sustain signals to the scan electrodes.

The sustain driver 70 supplies a drive signal to the sustain electrode of the panel.

The driving controller 80 performs predetermined signal processing on the input image signal by using the signal processing information stored in the memory, converts the data into the data to be supplied to the address electrodes, and arranges the converted data according to a scanning order. Can be. In addition, the driving controller 80 may supply a timing control signal to the address driver 50, the scan driver 60, and the sustain driver 70 to control the timing of supplying the driving signals of the driving circuits. .

In the case of the plasma display device according to the present invention, the driving signal output from the scan driver board 64 may be supplied to the scan electrode formed in the panel through the connection member 66.

The connecting member 66 is connected to a printed circuit board (PCB) on which one end of the scan driver board 64 is formed, and the other end of the connection member 66 is electrically connected to the scan driver board 64 and the respective scan electrodes. .

As shown in FIG. 5, the connecting member 66 may be a flexible printed circuit (FPC) to connect the printed circuit board (PCB) and the scan electrodes of the panel formed on opposite surfaces of the heat dissipation frame 30. It is preferable that it consists of).

In addition, in order to supply a drive signal to the sustain electrode or the address electrode of the panel, a connection member as described above is provided between the sustain driver 70 and the sustain electrode formed on the panel or between the address driver 50 and the address electrode formed on the panel. Can be connected.

6 is a cross-sectional view showing an embodiment of the configuration of the back cover provided in the plasma display device according to the present invention.

Referring to Figure 6, it is preferable that a groove is formed on one surface of the back cover surrounding the panel and the frame.

A driving circuit, for example, a scan driver 60, a drive controller 80, and a sustain driver 70 may be disposed in the groove.

As shown in FIG. 6, by forming a concave groove in the back cover and disposing a driving circuit in the groove, noise or electromagnetic waves generated from the driving circuit can be shielded.

In FIG. 6, three grooves are formed, but the number of grooves formed in the back cover may be changed, and for example, grooves may be formed at a position corresponding to only a portion of a circuit in which noise or electromagnetic wave emission exceeds a reference value. Can be.

In addition, the scan driver 60 for supplying the driving signal to the scan electrode and the sustain driver 70 for supplying the driving signal to the sustain electrode may be implemented as a scan-sustain integrated board located together at one side of the panel. Two grooves may be formed in the back cover, and the driving controller 80 and the scan-sustain integrated board may be disposed in each of the grooves.

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

Referring to FIG. 7, the frame 110 may be positioned between the panel 100 and the back cover 120, and the back cover 120 may have convex grooves in the direction of the panel 100.

The scan driver 130, the drive controller 140, and the sustain driver 150 may be disposed in the grooves convex toward the panel 100 in the back cover 120.

As illustrated in FIG. 7, the scan driver 130, the drive controller 140, and the sustain driver 150 are disposed on the grooves of one side of the back cover opposite to the panel, thereby generating noise and electromagnetic waves when the panel is driven. At the same time, the driving circuit and the panel can be separated to prevent malfunction of the driving circuit or the panel due to mutual influence.

As illustrated in FIG. 7, an area corresponding to the positions of the grooves formed in the back cover 120 of the frame 110 may be open. This reduces the manufacturing cost of the frame and simplifies the frame making process. For example, the frame 110 may have a structure in which a plurality of frames are coupled to each other, and in this case, the frame compatibility may be improved.

In addition, in order to dissipate heat generated from the scan driver 130, the drive controller 140 and the sustain driver 150 or the panel, between the groove of the back cover 120 and the drive circuits 130, 140, and 150. A thermally conductive tape may be attached between the panel 100 and the back cover 120.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

1 is a perspective view illustrating an embodiment of a structure of a plasma display panel.

2 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel.

FIG. 3 is a timing diagram illustrating an embodiment of a method of time-divisionally driving a plasma display panel by dividing one frame into a plurality of subfields.

4 is a timing diagram illustrating an embodiment of a waveform of a driving signal for driving a plasma display panel.

5 is a diagram illustrating an embodiment of a configuration of a driving apparatus for driving a plasma display panel.

6 is a cross-sectional view showing an embodiment of the configuration of the back cover provided in the plasma display device according to the present invention.

7 is a perspective view showing an embodiment of a schematic configuration of a plasma display device according to the present invention.

Claims (5)

A plasma display panel having a plurality of electrodes formed thereon; A driving unit generating a driving signal supplied to the plurality of electrodes; A driving signal supply unit supplying the generated driving signal to the plurality of electrodes; A back cover surrounding the rear of the panel; And A frame disposed between the panel and the back cover and having the driving signal supply unit disposed therein; A convex groove is formed in one surface of the back cover, and the driving unit is disposed in the groove. The method of claim 1, And the back cover is positioned between the driver and the panel. The method of claim 1, And a region of the frame corresponding to the position where the groove is formed is open. The method of claim 1, The driving unit includes a scan driver for generating a driving signal supplied to the scan electrode, a sustain driver for generating a driving signal supplied to the sustain electrode, and a controller for controlling the scan driver and the sustain driver, And three grooves on which the scan driver, the sustain driver, and the controller are disposed, are formed on one surface of the back cover. The method of claim 1,  The driving unit is disposed on one surface of the region in which the groove is formed in the back cover, and a thermal conductive tape is attached to the other surface.

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