Patent Grant
8259036
This application claims the benefit of Korean Patent Application No. 10-2006-0103946 filed on Oct. 25, 2006, which is hereby incorporated by reference.
1. Field of the Disclosure
This document relates to a plasma display apparatus.
2. Description of the Related Art
A plasma display apparatus includes a plasma display panel displaying an image and a filter positioned in front of the plasma display panel.
The plasma display panel includes phosphor layers inside discharge cells partitioned by barrier ribs and a plurality of electrodes. Driving signals are supplied to the discharge cells through the electrodes.
When the driving signal generates a discharge inside the discharge cells, a discharge gas filled in the discharge cells generates vacuum ultraviolet rays, which thereby cause phosphors formed inside the discharge cells to emit light, thus displaying an image on the screen of the plasma display panel.
In one aspect, a plasma display apparatus comprises a plasma display panel including a front substrate on which an upper dielectric layer is positioned, a black layer being omitted between the front substrate and the upper dielectric layer, a first electrode and a second electrode positioned between the front substrate and the upper dielectric layer, and a rear substrate on which a third electrode is positioned to intersect the first electrode and the second electrode, and a filter positioned in front of the plasma display panel, the filter including a first portion having a first degree of blackness and a second portion that is positioned on the first portion and has a second degree of blackness larger than the first degree of blackness.
In another aspect, a plasma display apparatus comprises a plasma display panel including a front substrate on which an upper dielectric layer is positioned, a first electrode and a second electrode positioned between the front substrate and the upper dielectric layer, one surface of each of the first electrode and the second electrode contacting the front substrate, and the other surface of each of the first electrode and the second electrode contacting the upper dielectric layer, and a rear substrate on which a third electrode is positioned to intersect the first electrode and the second electrode, and a filter positioned in front of the plasma display panel, the filter including a first portion having a first degree of blackness and a second portion that is positioned on the first portion and has a second degree of blackness larger than the first degree of blackness.
In still another aspect, a plasma display apparatus comprises a plasma display panel including a front substrate on which an upper dielectric layer is positioned, a black layer being omitted between the front substrate and the upper dielectric layer, a first electrode and a second electrode positioned between the front substrate and the upper dielectric layer, and a rear substrate on which a third electrode is positioned to intersect the first electrode and the second electrode, and a filter positioned in front of the plasma display panel, the filter including a first portion having a first degree of blackness and a second portion that is positioned in the first portion and has a second degree of blackness larger than the first degree of blackness, wherein a first signal is supplied to the first electrode and a second signal of a polarity direction opposite a polarity direction of the first signal is supplied to the second electrode during a pre-reset period prior to a reset period of at least one subfield of a frame.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated on and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
Reference will now be made in detail embodiments of the invention examples of which are illustrated in the accompanying drawings.
As illustrated in
The plasma display panel 100 includes a front substrate 201 and a rear substrate 211 which coalesce to be opposite to each other. On the front substrate 201, a first electrode 202 and a second electrode 203 are positioned parallel to each other. On the rear substrate 211, a third electrode 213 is positioned to intersect the first electrode 202 and the second electrode 203.
An upper dielectric layer 204 for covering the first electrode 202 and the second electrode 203 is positioned on the front substrate 201 on which the first electrode 202 and the second electrode 203 are positioned. The upper dielectric layer 204 limits discharge currents of the first electrode 202 and the second electrode 203 and provides electrical insulation between the first electrode 202 and the second electrode 203.
A protective layer 205 is positioned on the upper dielectric layer 204 to facilitate discharge conditions. The protective layer 205 may include a material having a high secondary electron emission coefficient, for instance, magnesium oxide (MgO).
A lower dielectric layer 215 for covering the third electrode 213 is positioned on the rear substrate 211 on which the third electrode 213 is positioned. The lower dielectric layer 215 provides insulation of the third electrode 213.
Barrier ribs 212 of a stripe type, a well type, a delta type, a honeycomb type, and the like, are positioned between the front substrate 201 and the rear substrate 211 to partition discharge spaces (i.e., discharge cells). A red (R) discharge cell, a green (G) discharge cell, and a blue (B) discharge cell, and the like, are positioned between the front substrate 201 and the rear substrate 211.
In addition to the red (R), green (G), and blue (B) discharge cells, a white or yellow discharge cell may be further positioned.
Widths of the red (R), green (G), and blue (B) discharge cells may be substantially equal to one another. The width of at least one of the red (R), green (G), and blue (B) discharge cells may be different from the widths of the other discharge cells.
For instance, a width of the red (R) discharge cell is the smallest, and widths of the green (G) and blue (B) discharge cells are larger than the width of the red (R) discharge cell. Further, the width of the discharge cell determines a width of a phosphor layer 114 formed inside the discharge cell. For instance, a width of a blue (B) phosphor layer formed inside the blue (B) discharge cell is larger than a width of a red (R) phosphor layer formed inside the red (R) discharge cell. Further, a width of a green (G) phosphor layer formed inside the green (G) discharge cell is larger than the width of the red (R) phosphor layer formed inside the red (R) discharge cell. Hence, because the amount of blue light is more than the amount of red light, a color temperature of a displayed image is improved.
The plasma display panel 100 may have various forms of barrier rib structures. For instance, the barrier rib 112 may include a first barrier rib (not shown) and a second barrier rib (not shown) intersecting each other. The barrier rib 112 may have a differential type barrier rib structure in which a height of the first barrier rib and a height of the second barrier rib are different from each other, a channel type barrier rib structure in which a channel usable as an exhaust path is formed on at least one of the first barrier rib or the second barrier rib, a hollow type barrier rib structure in which a hollow is formed on at least one of the first barrier rib or the second barrier rib, and the like.
While the plasma display panel 100 has been illustrated and described to have the red (R), green (G), and blue (B) discharge cells arranged on the same line, it is possible to arrange them in a different pattern. For instance, a delta type arrangement in which the red (R), green (G), and blue (B) discharge cells are arranged in a triangle shape may be applicable. Further, the discharge cells may have a variety of polygonal shapes such as pentagonal and hexagonal shapes as well as a rectangular shape.
The discharge cell partitioned by the barrier rib 212 is filled with a predetermined discharge gas. The phosphor 214 for emitting visible light for an image display during the generation of an address discharge is positioned inside the discharge cell. For instance, red (R), green (G) and blue (B) phosphors 214 may be positioned.
In addition to the red (R), green (G) and blue (B) phosphors 214, white or yellow phosphor may be positioned.
A thickness of at least one of the phosphor layers 114 inside the red (R), green (G) and blue (B) discharge cells may be different from thickness of the other phosphor layers. For instance, thicknesses of the phosphor layers inside the green (G) and blue (B) discharge cells are larger than a thickness of the phosphor layer inside the red (R) discharge cell.
The third electrode 113 may have a substantially constant width or thickness. Further, a width or thickness of the third electrode 113 inside the discharge cell may be different from a width or thickness of the third electrode 113 outside the discharge cell. For instance, a width or thickness of the third electrode 113 inside the discharge cell may be larger than a width or thickness of the third electrode 113 outside the discharge cell.
The filter 110 includes a shielding layer 220 for shielding light coming from the outside. The filter 110 further includes a color layer 230 and an electromagnetic interference (EMI) shielding layer 240.
A first adhesive layer 251 is positioned between the shielding layer 220 and the color layer 230 to attach the shielding layer 220 to the color layer 230. A second adhesive layer 252 is positioned between the color layer 230 and the EMI shielding layer 240 to attach the color layer 230 to the EMI shielding layer 240.
A reference numeral 260 indicates a substrate formed of a polymer resin-based material or a glass-based material. The substrate 260 provides formation spaces of the shielding layer 220, the color layer 230 and the EMI shielding layer 240.
A reference numeral 250 indicates a third adhesive layer positioned to attach the filter 110 to the plasma display panel 100. In case that the substrate 260 formed of a glass-based material is used, the third adhesive layer 250 may be omitted.
The filter 110 may further include a near infrared ray shielding layer.
Locations of the shielding layer 220, the color layer 230, the EMI shielding layer 240 and the substrate 260 may vary. For instance, the EMI shielding layer 240 may be positioned on the substrate 260, the color layer 230 may be positioned on the EMI shielding layer 240, and the shielding layer 220 may be positioned on the color layer 230.
As illustrated in
The first portion 130 may be formed of a substantially transparent material, for instance, a substantially transparent resin material. Supposing that the first portion 130 has a first degree of blackness.
The second portion 120 is positioned on the first portion 130 and has a second degree of blackness larger than the first degree of blackness. In other words, the second portion 120 is darker than the first portion 130. For instance, the second portion 120 may be formed of a carbon-based material and may be substantially black.
The second portion 120 has a gradually decreasing width as it goes toward the first portion 130. Accordingly, one side of the first portion 130 parallel to the base of the second portion 120 and one side of the second portion 120 may form a predetermined angle θ1. The angle θ1 may be equal to or more than about 70° and less than about 90°.
As illustrated in
When a refractive index of the second portion 120 is smaller than a refractive index of the first portion 130 and one side of the first portion 130 parallel to the base of the second portion 120 and one side of the second portion 120 form the predetermined angle θ1, light coming from the inside of the filter can be emitted more efficiently to the outside and light coming from the outside of the filter can be absorbed more efficiently. Hence, contrast of an image displayed on the plasma display panel can be improved.
To more effectively absorb light coming from the outside of the filter and to more effectively emit light coming from the inside of the filter, the refractive index of the second portion 120 may range from 0.8 to 0.999 times the refractive index of the base portion 420.
A height t3 of the first portion 130 may range from 1.01 to 2.25 times a height t2 of the second portion 120. Hence, a yield increase in a manufacturing process and the durability of the filter can be sufficiently secured, light coming from the outside of the filter can be sufficiently blocked, and transparency of light coming from the inside of the filter can be sufficiently secured.
Furthermore, a shortest interval t4 between the second portions 120 may range from 1.1 to 5 times a width t1 of the base of the second portion 120. Hence, an aperture ratio of the filter can be sufficiently secured, light coming from the outside of the filter is sufficiently blocked, and the second portion 120 can be easily manufactured.
Furthermore, a longest interval t5 between the second portions 120 may range from 1.1 to 3.25 times the shortest interval t4 between the second portions 120. Hence, the aperture ratio of the filter is sufficiently secured, and the angle θ1 of the second portion 120 can be set to an ideal value so that light coming from the outside of the filter is sufficiently blocked.
A height t2 of the second portion 120 may range from 0.89 to 4.25 times the shortest interval t4 between the second portions 120. Hence, the aperture ratio of the filter is sufficiently secured, and light coming from the outside of the filter is sufficiently blocked.
For instance, the width t1 of the base of the second portion 120 may range from 18 μm to 35 μm.
The height t2 of the second portion 120 may range from 80 μm to 170 μm.
A height t3 of the first portion 130 may range from 100 μm to 180 μm.
The shortest interval t4 between the second portions 120 may range from 40 μm to 90 μm.
The longest interval t5 between the second portions 120 may range from 90 μm to 130 μm.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As above, when the traveling direction of the second portion 520 and the long side of the first portion 510 form the predetermined angle θ2, an interference fringe (i.e., Moire fringe) produced when two or more periodic patterns overlap can be efficiently prevented. To more effectively prevent Moire fringe, the predetermined angle θ2 may range from about 5° to 80°.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As above, when two or more shielding layers each having a different pattern are used together, a viewing angle of the filter can be variously controlled.
As illustrated in
A refractive index of the external layer 811 may be smaller than a refractive index of a first portion 820, and a refractive index of the internal layer 812 may be different from or equal to the refractive index of the external layer 811. For instance, the refractive index of the internal layer 812 is smaller than the refractive index of the external layer 811.
As illustrated in
A reference numeral 910 indicates a substrate formed of a resin-based material.
As illustrated in
In
As illustrated in
In this case, it is likely that the first black layer 1020 absorbs light coming from the outside. However, when light coming from the inside of the plasma display panel 1000 is emitted to the outside, the light is shielded by the shielding layer 1030 and the first black layer 1020. Hence, a luminance of an image is excessively reduced and a contrast characteristic is bad.
As illustrated in
Since light coming from the inside of the plasma display panel 1000 can be emitted to the outside without the hindrance of the first black layer, a reduction in a luminance can be prevented. Since the filter including the shielding layer 1030 is positioned in front of the plasma display panel 1000, the shielding layer 1030 can absorb sufficiently light coming from the outside of the plasma display panel 1000. Accordingly, although the first black layer is omitted, an excessive increase in the generation of reflection light caused by the barrier rib 1012 can be prevented.
To prevent a reduction in a luminance of an image while the contrast characteristic is maintained at a high level, when the filter positioned in front of the plasma display panel 1000 includes the shielding layer 1030 including the first portion 1031 and the second portion 1032, the first black layer may be omitted between the upper dielectric layer 1004 and the front substrate 1001. In other words, the upper dielectric layer 1004 contacts the front substrate 1001 at a location corresponding to the barrier rib 1012.
The second black layers 1100a and 1100b suppress light coming from the outside from being reflected by the first electrode 1102 and the second electrode 1103, and thus contribute to the improvement of a contrast characteristic.
When a filter positioned in front of a plasma display panel 1110 includes a shielding layer 1120 including a first portion 1121 and a second portion 1122, it is likely that the second black layers 1100a and 1100b absorb light coming from the outside. However, when light coming from the inside of the plasma display panel 1110 is emitted to the outside, the light is shielded by the shielding layer 1120 and the second black layers 1100a and 1100b. Hence, a luminance of an image is excessively reduced and a contrast characteristic is bad.
As illustrated in
Since light coming from the inside of the plasma display panel 1110 can be emitted to the outside without the hindrance of the second black layer, a reduction in a luminance can be prevented. Since the filter including the shielding layer 1120 is positioned in front of the plasma display panel 1110, the shielding layer 1120 can absorb sufficiently light coming from the outside of the plasma display panel 1000. Accordingly, although the second black layer is omitted, an excessive increase in the generation of reflection light caused by the first electrode 1102 and the second electrode 1103 can be prevented.
To prevent a reduction in the luminance of the image while the contrast characteristic is maintained at a high level, when the filter positioned in front of the plasma display panel 1110 includes the shielding layer 1120 including the first portion 1121 and the second portion 1122, the second black layer may be omitted in the area corresponding to the first electrode 1102 and the second electrode 1103 between the upper dielectric layer 1104 and the front substrate 1101. In other words, one surface of each of the first electrode 1102 and the second electrode 1103 contacts the front substrate 1101 and the other surface of each of the first electrode 1102 and the second electrode 1103 contacts the upper dielectric layer 1104.
As above, when the black layer is omitted between the upper dielectric and the front substrate, process time required in a manufacturing process of the black layer and the manufacturing cost can be reduced. Hence, the manufacturing cost of the plasma display apparatus can be reduced.
As illustrated in (a) of
For instance, the first electrode 1210 and the second electrode 1220 each include transparent electrodes 1210a and 1220a and bus electrodes 1210b and 1220b.
The transparent electrodes 1210a and 1220a may include a transparent material such as indium-tin-oxide (ITO). The bus electrodes 1210b and 1220b may include a-metal material such as silver (Ag).
The transparent electrodes 1210a and 1220a are formed and then the bus electrodes 1210b and 1220b are formed to complete the first electrode 1210 and the second electrode 1220.
As illustrated in (b) of
At least one of the first electrode 1230 or the second electrode 1240 may include a substantially opaque metal material with excellent electrical conductivity. Examples of the opaque metal with excellent electrical conductivity include silver (Ag), copper (Cu) and aluminum (Al) that are cheaper than ITO. At least one of the first electrode 1230 or the second electrode 1240 may further include a black material such as carbon (C), cobalt (Co) or ruthenium (Ru).
A process for forming the transparent electrodes 1210a and 1220a and a process for forming the bus electrodes 1210b and 1220b are required in (a) of
Further, because an expensive material such as ITO is not used in (b) of
As illustrated in
Because the first electrode 1210 and the second electrode 1220 each include the transparent electrodes 1210a and 1220a and the bus electrodes 1210b and 1220b in (a) of
On the contrary, because the transparent electrode is omitted in (b) of
To prevent a reduction in the luminance in the first electrode 1230 and the second electrode 1240 each having the single-layered structure, the black layer may be omitted between the upper dielectric layer and the front substrate in the same way as
As illustrated in
The line portions 1310a, 1310b, 1340a and 1340b each intersect a third electrode 1370 inside a discharge cell partitioned by a barrier rib 1300.
The line portions 1310a, 1310b, 1340a and 1340b are spaced apart from one another with a predetermined distance therebetween. For instance, the first and second line portions 1310a and 1310b of the first electrode 1330 are spaced apart from each other with a distance d1 therebetween. The first and second line portions 1440a and 1440b of the second electrode 1460 are spaced apart from each other with a distance d2 therebetween. The distance d1 may be equal to or different from the distance d2.
The line portions 1310a, 1310b, 1340a and 1340b may have a predetermined width. For instance, the first line portion 1310a of the first electrode 1330 has a width Wa, and the second line portion 1310b of the first electrode 1330 has a width Wb.
A shape of the first electrode 1330 may be symmetrical or asymmetrical to a shape of the second electrode 1360 inside the discharge cell. For instance, while the first electrode 1330 may include three line portions, the second electrode 1360 may include two line portions.
The number of line portions in the first and second electrodes 1330 and 1360 may vary. For instance, the first electrode 1330 or the second electrode 1360 may include 4 or 5 line portions.
At least one of the first electrode 1330 or the second electrode 1360 may include at least one projecting portion. For instance, the first electrode 1330 includes two projecting portions 1320a and 1320b, and the second electrode 1360 includes two projecting portions 1350a and 1350b.
The projecting portions 1320a and 1320b of the first electrode 1330 project from the first line portion 1310a, and the projecting portions 1350a and 1350b of the second electrode 1360 project from the first line portion 1340a. The projecting portions 1320a, 1320b, 1350a and 1350b are parallel to the third electrode 1370.
An interval g1 between the first and second electrodes 1330 and 1360 at the projecting portions 1320a, 1320b, 1350a and 1350b is shorter than an interval g2 between the first and second electrodes 1330 and 1360 in the discharge cell. Accordingly, a firing voltage of a discharge generated between the first electrode 1330 and the second electrode 1360 can be lowered.
While the first electrode 1330 and the second electrode 1360 each include two projecting portions in
As illustrated in
As illustrated in
As illustrated in
While the first and second line portions 1410a and 1410b of the first electrode 1430 are connected using one connecting portion 1420c in
Referring to
The projecting portions 1520a, 1520b, 1550a and 1550b projecting toward the first direction is called a first projecting portion, and The projecting portions 1520d and 1550d projecting toward the second direction is called a second projecting portion. The first direction may be opposite to the second direction. For instance, the first direction may be a direction toward the center of a discharge cell, and the second direction may be a direction opposite the direction toward the center of the discharge cell.
The projecting portions 1520c and 1550c, that project toward the direction opposite the direction toward the center of the discharge cell, more widely diffuse a discharge generated inside the discharge cell.
While the first and second electrodes 1530 and 1560 each include only one second projecting portion projecting toward the second direction in
As illustrated in
A width of the first projecting portions 1620a, 1620b, 1650a and 1650b is set to a tenth width W10, A width of the second projecting portions 1620d and 1650d is set to a twentieth width W20 smaller than the tenth width W10.
By setting the tenth width W10 of the first projecting portions 1620a, 1620b, 1650a and 1650b to be larger than the twentieth width W20 of the second projecting portions 1620d and 1650d, a firing voltage of a discharge generated between a first electrode 1630 and a second electrode 1660 can be lowered.
As illustrated in
By setting the tenth width W10 of the second projecting portions 1620d and 1650d to be larger than the twentieth width W20 of the first projecting portions 1620a, 1620b, 1650a and 1650b, a discharge generated inside a discharge cell can be efficiently diffused into the rear of the discharge cell.
As illustrated in
The length of the first projecting portions 1720a, 1720b, 1750a and 1750b is set to a first length L1. The length of the second projecting portions 1720d and 1750d is set to a second length L2 shorter than the first length L1.
By setting the first length L1 of the first projecting portions 1720a, 1720b, 1750a and 1750b to be longer than the second length L2 of the second projecting portions 1720d and 1750d, a firing voltage of a discharge generated between a first electrode 1730 and a second electrode 1760 can be lowered.
As illustrated in
By setting the first length L1 of the second projecting portions 1720d and 1750d to be longer than the second length L2 of the first projecting portions 1720a, 1720b, 1750a and 1750b, a discharge generated inside a discharge cell can be efficiently diffused into the rear of the discharge cell.
As illustrated in
Further, a portion where the line portions 1810a, 1810b, 1840a and 1840b are adjacent to connecting portions 1820c and 1850c may include the curvature.
As a result, the first electrode 1830 and the second electrode 1860 can be easily manufactured. Further, the portion with the curvature prevents wall charges from being excessively accumulated on a specific portion during a driving of the panel, and thus a driving stability can be improved.
As illustrated in
Each subfield is subdivided into a reset period for initializing all the cells, an address period for selecting cells to be discharged, and a sustain period for representing gray level in accordance with the number of discharges.
For instance, if an image with 256-level gray scale is to be displayed, a frame, as illustrated in
The number of sustain signals supplied during the sustain period determines gray level weight in each of the subfields. For instance, in such a method of setting gray level weight of a first subfield to 20 and gray level weight of a second subfield to 21, the sustain period increases in a ratio of 2n (where, n=0, 1, 2, 3, 4, 5, 6, 7) in each of the subfields. Since the sustain period varies from one subfield to the next subfield, a specific gray level is achieved by controlling the sustain period which are to be used for discharging each of the selected cells, i.e., the number of sustain discharges that are realized in each of the discharge cells.
The plasma display apparatus according to the exemplary embodiment uses a plurality of frames to display an image for 1 second. For instance, 60 frames are used to display an image 1 second. In this case, a time width T of one frame may be 1/60 seconds, i.e., 16.67 ms.
In
Further, in
During a pre-reset period prior to a reset period, a first signal with a gradually falling voltage is supplied to a first electrode Y. A second signal corresponding to the first signal is supplied to a second electrode Z. A polarity direction of the second signal is opposite to a polarity direction of the first signal. The second signal is constantly maintained at a voltage Vpz. The voltage Vpz may be substantially equal to a voltage (i.e., a sustain voltage Vs) of a sustain signal (SUS) to be supplied during a sustain period.
As above, when the first signal is supplied to the first electrode Y and the second signal is supplied to the second electrode Z during the pre-reset period, wall charges of a predetermined polarity are accumulated on the first electrode Y, and wall charges of a polarity opposite the polarity of the wall charges accumulated on the first electrode Y are accumulated on the second electrode Z. For instance, wall charges of a positive polarity are accumulated on the first electrode Y, and wall charges of a negative polarity are accumulated on the second electrode Z.
During a reset period, a third signal is supplied to the first electrode Y. The third signal includes a first rising signal and a second rising signal. The first rising signal gradually rises from a second voltage V2 to a third voltage V3 with a first slope, and the second rising signal gradually rises from the third voltage V3 to a fourth voltage V4 with a second slope.
The third signal generates a weak dark discharge (i.e., a setup discharge) inside the discharge cell during a setup period of the reset period, thereby accumulating a proper amount of wall charges inside the discharge cell.
The setup discharge does not occur at a voltage equal to or less than the third voltage V3, and the setup discharge can occur at a voltage equal to or more than the third voltage V3. Therefore, a voltage of the first electrode Y rapidly rises up to the third voltage V3 and then lowly rises. Hence, an excessive increase in a time width of the setup period can be prevented, and a stability of the setup discharge can be improved. Considering this, it is preferable that the second slope is gentler than the first slope.
Wall charges accumulated inside the discharge cells during the pre-reset period can assist the setup discharge generated during the setup period. Accordingly, although a voltage of the third signal is lowered, the stable setup discharge can occur. When the voltage of the third signal is lowered, the intensity of the setup discharge can be reduced and a reduction in the contrast characteristic can be prevented.
The operation of the plasma display apparatus during the pre-reset period can prevent a reduction in the contrast characteristic generated a case where the black layer is omitted between the upper dielectric layer and the front substrate as illustrated in
A subfield, which is first arranged in time order in a plurality of subfields of one frame, may include a pre-reset period prior to a reset period so as to obtain sufficient driving time. Or, two or three subfields may include a pre-reset period prior to a reset period.
During a set-down period of the reset period, a fourth signal of a polarity direction opposite a polarity direction of the third signal is supplied to the first electrode Y. The fourth signal gradually falls from a fifth voltage V5 lower than a peak voltage (i.e., the fourth voltage V4) of the third signal to a sixth voltage V6. The fourth signal generates a weak erase discharge (i.e., a set-down discharge) inside the discharge cell. Furthermore, the remaining wall charges are uniform inside the discharge cells to the extent that an address discharge can be stably performed.
During an address period, a scan bias signal, which is maintained at a seventh voltage V7 higher than a lowest voltage (i.e., the sixth voltage V6) of the fourth signal, is supplied to the first electrode Y.
A scan signal (Scan), which falls from the scan bias signal by a scan voltage magnitude ΔVy, is supplied to the first electrode Y.
The width of the scan signal may vary from one subfield to the next subfield. For instance, the width of a scan signal in a subfield may be larger than the width of a scan signal in the next subfield in time order. Further, the width of the scan signal may be gradually reduced in the order of 2.6 μs, 2.3 μs, 2.1 μs, 1.9 μs, etc., or in the order of 2.6 μs, 2.3 μs, 2.3 μs, 2.1 μs, 1.9 μs, 1.9 μs, etc.
As above, when the scan signal (Scan) is supplied to the first electrode Y, a data signal (data) corresponding to the scan signal (Scan) is supplied to the third electrode X. The data signal (data) rises from a ground level voltage GND by a data voltage magnitude ΔVd.
As the voltage difference between the scan signal (Scan) and the data signal (data) is added to the wall voltage generated during the reset period, an address discharge is generated within the discharge cell to which the data signal (data) is supplied.
A sustain bias signal is supplied to the second electrode Z during the address period to prevent the generation of the unstable address discharge by interference of the second electrode Z. The sustain bias signal is substantially maintained at a sustain bias voltage Vz which is lower than the sustain voltage Vs and higher than the ground level voltage GND.
During the sustain period, a sustain signal (SUS) is alternately supplied to the first electrode Y and the second electrode Z. As the wall voltage within the discharge cell selected by performing the address discharge is added to the sustain voltage Vs of the sustain signal (SUS), every time the sustain signal (SUS) is supplied, a sustain discharge, i.e., a display discharge occurs between the first electrode Y and the second electrode Z. Accordingly, a predetermined image is displayed on the plasma display panel.
A plurality of sustain signals are supplied during a sustain period of at least one subfield, and a width of at least one of the plurality of sustain signals may be different from widths of the other sustain signals. For instance, a width of the first supplied sustain signal among the plurality of sustain signals may be larger than widths of the other sustain signals. Hence, a sustain discharge can more stably occur.
The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. The present teaching can be readily applied to other types of apparatuses. The description of the foregoing embodiments is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art.
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