KR100798463B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to improve operation efficiency of the PDP by decreasing a power consumption and a height difference of a PDP by forming both ends of an electrode line in a round shape. A plasma display device includes plural electrode lines. At least one of the electrode lines has a portion with a curvature between 0.1mm and 1000mm. The curvature of the electrode lines increases from an edge to a center portion of a PDP(Plasma Display Panel). At least one of the electrode lines has a portion with a curvature between 0.1mm and 10mm. At least one of the electrode lines has a portion with a curvature between 1.5mm and 2.5mm. At least one of the electrode lines is a scan electrode line or a sustain electrode line.

Description

Plasma Display Device

1 is a perspective view showing an embodiment of a structure of a plasma display panel according to the present invention.

2 is a cross-sectional view 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 driving signals for driving a plasma display panel.

5 to 6b are diagrams illustrating embodiments of electrode line shapes of the plasma display device according to the present invention.

FIG. 7 is a graph illustrating EMI (Electro Magnetic Interference) measured in a plasma display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device. In particular, the active area of the panel and the connection portion of the electrode pad portion are formed in an arc shape to reduce the occurrence of Electromagnetic Interference (EMI) by facilitating the flow of current when driving the panel. The present invention relates to a plasma display device.

In general, a plasma display panel (hereinafter referred to as a PDP) generates a discharge by applying a predetermined voltage to electrodes installed in a discharge space, and the plasma generated at the time of discharging the phosphor emits an image including a character or a graphic. As a display device, it is advantageous in that it is easy to enlarge, lighten, and thinner, to provide a wide viewing angle up, down, left, and right, and to realize full color and high brightness.

Each electrode line of the PDP is connected to a driving unit for applying a driving voltage to the panel and a connecting member such as a flexible printed circuit (FPC), and a connection pad portion connected to the FPC in the electrode line. Since the angle connecting the active area of the panel is angled, the flow of current is not smooth and EMI occurs. As described above, when EMI is generated, power consumption increases and a screen step occurs, thereby degrading the image quality of the plasma display panel.

The present invention has been made to solve the above-mentioned problems of the prior art, and in the electrode line connecting the active region and the FPC connection pad portion, the connection portion is formed in an arc shape to improve the EMI of the panel. It is an object of the present invention to provide a plasma display device.

The plasma display device according to the present invention for solving the above technical problem comprises a plurality of electrode lines, at least one of the plurality of electrode lines is characterized in that it comprises a portion having a curvature of 0.1mm to 1000mm. .

Preferably, the curvatures of the plurality of electrode lines are different from each other, and the curvatures of the plurality of electrode lines may increase as adjacent to the center of the plasma display panel.

Another plasma display device according to the present invention for solving the above technical problem is a plasma display panel formed with a plurality of electrode lines; A driving unit driving the plasma display panel; And a pad unit for connecting the plurality of electrode lines to the driving unit, wherein at least one of the plurality of electrode lines has a curvature of 0.1 mm to 1000 mm between the plasma display panel and the pad unit. .

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 showing an embodiment of a plasma display panel according to the present invention.

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, which are also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, and may not be physically connected because they are not formed at the same time. have.

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, phosphor layers are formed on the surfaces of the lower dielectric layer 23 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 usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition wall 21b having different heights of the vertical partition wall 21a and the horizontal partition wall 21b. A grooved barrier rib structure having a groove formed in at least one of the channel barrier rib structure, the vertical barrier rib 21a, or the horizontal barrier rib 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 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 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, a 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 driving signals for driving a plasma display panel with respect to the divided subfield.

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. A reset section for initializing the discharge cells of the entire screen 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.

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 negative scan signal scan is sequentially applied to the scan electrode, and at the same time, a positive data signal data 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. Meanwhile, a signal for maintaining a sustain voltage is applied to the sustain electrode during the set down period and the address period.

In the sustain period, a sustain pulse 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 driving waveforms shown in FIG. 4 are first 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. 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.

5 to 6b illustrate one embodiment of the electrode line shape of the plasma display device according to the present invention.

As shown in FIG. 5, the panel of the plasma display apparatus of the present invention includes bus electrodes 11b and 12b, and the bus electrodes 11b and 12b have an effective area W1 which is an area where an image is displayed by discharge. In general), a width within a range of 50 μm to 130 μm is formed at intervals of about 250 μm to 500 μm.

The bus electrodes 11b and 12b are connected to a driving unit for applying a driving voltage to the panel and a connection member such as a flexible printed circuit (FPC) and operate according to a driving signal applied from the driving unit. The bus electrodes 11b and 12b are connected to the electrode pads of the connecting member, and the bus electrodes formed in the region W3 connected to the electrode pads are formed to be narrower than the gaps formed in the effective region W1.

The bus electrodes 11b and 12b of the connection area W2 connecting the bus electrodes 11b and 12b formed in the effective area W1 and the area W3 (hereinafter referred to as an electrode pad portion) connected to the electrode pad have a predetermined slope. It is formed to have. Here, the connection area W2 connecting the electrode pad part W3 and the effective area W1 and the electrode pad part is referred to as an ineffective area in which a screen is not displayed.

The slopes of the electrode lines of the different bus electrodes 11b and 12b formed in the connection region W2 may be the same or different. In addition, the bus electrodes 11b and 12b of the connection region W2 should be wired longer than the shortest distance between the effective region W1 and the electrode pad portion W3. Both ends of the bus electrodes 11b and 12b are formed in an arc shape having predetermined curvatures R1 to Rn and R'1 to R'n so that the electrode pad portion W3 and the connection area W2 are formed. ) Is combined.

That is, in at least one electrode line provided in the connection region W2 of the non-active region connecting the effective region W1 of the panel and the electrode pad portion W3 connected to the FPC, the electrode line is an effective region or / and The connection part with the electrode pad part should be formed in arc shape.

At this time, since both ends of the electrode lines of the bus electrodes 11b and 12b formed in the connection region W2 are formed in an arc shape, the distance between the conventional effective region W1 and the electrode pad portion W3 is the shortest distance. Unlike the structure formed so as to be connected to the bus electrode of the present invention, the active region and the electrode pad portion are not connected in the shortest distance.

As shown in FIG. 5, when both ends of the lines of the bus electrodes 11b and 12b formed in the connection region W2 are rounded with curvatures R1 to Rn and R′1 to R′n of 0.01 to 1000 mm. As the current flows smoothly, EMI generated during panel driving can be reduced.

Since the plasma display apparatus is driven by applying a voltage of about tens to hundreds of volts, when the bus electrode lines 11b and 12b are formed to be angular, the flow of current does not flow smoothly in the angular portions, so that EMI is increased. If the bus electrode lines 11b and 12b are formed without angled portions as shown in the drawing, the current flows smoothly.

When both ends of the lines of the bus electrodes 11b and 12b have curvatures R1 to Rn and R'1 to R'n of 0.1 to 10 mm, the effect of reducing power consumption and maximum power consumption can be maximized.

In addition, when both ends of the lines of the bus electrodes 11b and 12b have curvatures R1 to Rn and R'1 to R'n of 0.1 to 10 mm, plasma generation by reducing the screen step along with EMI generation and power consumption is reduced. The image quality characteristics of the display panel may be improved.

Curvatures R1 to Rn and R'1 to R'n of the plurality of bus electrode lines 11b and 12b may be the same or different from each other. When the curvatures R1 to Rn and R'1 to R'n of the lines of the plurality of bus electrodes 11b and 12b are different from each other, the curvatures R1 to Rn and R'1 are more adjacent to the center of the plasma display panel. To R'n) can be increased.

That is, the curvatures at both ends of the connection region W2 may be different in one bus electrode line 11b and 12b, and the curvatures at both ends of the connection region may be different in different bus electrode lines. It can be.

The electrode lines formed in the plasma display device of the present invention may have a shape as shown in FIGS. 6A to 6B. As shown in FIG. 6A, an end portion connected to the connection terminal portion W3 in the connection region W2 is formed in an arc shape with predetermined curvatures R1 to Rn, and is connected to the connection region W2. The intermediate region may be formed in the shape of a groove with a convex center.

As shown in FIG. 6B, both ends of the lines of the bus electrodes 11b and 12b of the connection region W2 have an arc shape with predetermined curvatures R1 to Rn and R'1 to R'n. It may be formed, and the connection region (W2) may be formed in the 'S' shape lying down. In this case, the bus electrode line is formed in the connection portion of the bus electrode line by a predetermined length in a straight line, and is formed in a 'S' shape lying down with a predetermined curvature.

In the present specification, the bus electrodes 11b and 12b provided in the sustain electrode pairs 11 and 12 formed on the upper substrate 10 of the plasma display apparatus are described as an example. It is noted that the present invention can be applied not only to the address electrode 22 formed on the substrate 20 but also to various electrode lines.

7 is a graph illustrating EMI measured from a plasma display device.

As shown in FIG. 7, the magnitude of EMI generated when the plasma display apparatus is driven according to the prior art has a value of up to 70 dB in a module state (with a driving unit coupled to a panel) (a) whereas the plasma of the present invention When both ends of the connection area W2 of the bus electrodes 11b and 12b are rounded without being angular as in the display device, the EMI size has a maximum value of 65 dB (b).

In addition, the magnitude of the EMI generated in the mesh glass set state is 33 dB in the prior art (c), and in the case of the plasma display device of the present invention, EMI of up to 29 dB is generated (d). .

In both cases, in the connection area W2 connecting the effective area W1 and the connection pad part W3 in the bus electrodes 11b and 12b, both ends contacting the active area and the connection pad part are arc shaped. If formed roundly, the size of EMI generated is reduced. As a result, power consumption of the plasma display apparatus may be reduced, and the screen step may be reduced.

As described above, the plasma display device 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 is applied by those skilled in the art within the technically protected scope of the present invention. This is possible.

In the plasma display device of the present invention configured as described above, in the electrode line provided in the panel, both ends of the electrode line of the portion connecting the active region and the electrode pad portion are formed to be rounded to reduce the generation of EMI to reduce the power consumption and the screen. By reducing the step difference, there is an effect of improving the driving efficiency and image quality characteristics of the plasma display device.

Claims (12)

In the plasma display device including a plurality of electrode lines, At least one of the plurality of electrode lines It includes a portion having a curvature of 0.1mm to 1000mm, And the curvature of the plurality of electrode lines increases as adjacent to the center of the plasma display panel. The method of claim 1, At least one of the plurality of electrode lines And a portion having a curvature of 0.1 mm to 10 mm. The method of claim 1, At least one of the plurality of electrode lines Plasma display device comprising a portion having a curvature of 1.5mm to 2.5mm. The method of claim 1, And at least one of the plurality of electrode lines is a scan electrode line or a sustain electrode line. The method of claim 1, At least one of the plurality of electrode lines And a portion having a curvature of 0.1 mm to 1000 mm outside the effective area of the plasma display panel. The method of claim 1, Two or more of the plurality of electrode lines includes a portion having a curvature of 0.1mm to 1000mm, And a curvature of the plurality of electrode lines is different from each other. delete A plasma display panel in which a plurality of electrode lines are formed; A driving unit driving the plasma display panel; And A pad unit for connecting the plurality of electrode lines to the driving unit; At least one of the plurality of electrode lines It has a curvature of 0.1mm to 1000mm between the plasma display panel and the pad portion, And the curvature of the plurality of electrode lines increases as adjacent to the center of the plasma display panel. The method of claim 8, At least one of the plurality of electrode lines And a portion having a curvature of 0.1 mm to 10 mm. The method of claim 8, At least one of the plurality of electrode lines Plasma display device comprising a portion having a curvature of 1.5mm to 2.5mm. The method of claim 8, Two or more of the plurality of electrode lines includes a portion having a curvature of 0.1mm to 1000mm, The curvature of the plurality of electrode lines are different from each other, the plasma display device. delete

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