KR100590058B1 - Plasma display panel and a driving method of the same - Google Patents

Abstract

The present invention relates to a plasma display panel having improved discharge efficiency by improving the shape of the discharge sustaining electrode.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention, the first substrate and the second substrate disposed opposite to each other; Address electrodes formed in one direction on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; And a first electrode and a second electrode corresponding to each discharge cell while extending in a direction crossing the address electrode on the first substrate, wherein the first electrode extends toward the second electrode. The second electrode has a recess for accommodating the protrusion of the first electrode, wherein the protrusion and the recess are spaced at a first interval in a direction crossing the address electrode and are parallel to the address electrode. Spaced at a second interval that is greater than the interval.

Plasma display panel, bulkhead, phosphor, efficiency

Description

Plasma display panel and driving method thereof {PLASMA DISPLAY PANEL AND A DRIVING METHOD OF THE SAME}

1 is a partial plan view of a plasma display panel according to a first embodiment of the present invention.

2 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

3 is a partial plan view of a plasma display panel according to a third embodiment of the present invention.

4 is a first driving waveform diagram of a plasma display panel according to a second embodiment and a third embodiment of the present invention.

5 is a second driving waveform diagram of the plasma display panel according to the second and third embodiments of the present invention.

6 is an exploded perspective view of a plasma display panel according to the prior art.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel for improving the discharge efficiency by improving the shape of the discharge sustaining electrode.

Plasma Display Panel (PDP) is a red (R), green (G), blue (B) generated by the vacuum ultraviolet (VUV: Vacuum Ultra-Violet) emitted from the plasma obtained through gas discharge to excite the phosphor A display device that implements a predetermined image using visible light. The PDP can realize a 60-inch or larger screen with a thickness of only 10 cm or less, and since it is a self-luminous display device such as a CRT, it has no characteristic of distortion due to color reproduction and viewing angle, and also has a simple manufacturing method compared to LCD. It is gaining attention as a TV and industrial flat panel display that have strengths in terms of productivity and cost.

Referring to FIG. 6, in a conventional AC plasma display panel, an address electrode 112 is formed on a second substrate 110 in one direction (the x-axis direction of the drawing) and covers the address electrode 112. The dielectric layer 113 is formed on the entire surface of the second substrate 110. The partition wall 115 arranged in a stripe or matrix shape on the dielectric layer 113 defines a discharge cell. Phosphor layers 117 of red (R), green (G), and blue (B) colors are formed on the side surfaces of the partition walls 115 and the bottom surfaces of the discharge cells 19.

One surface of the first substrate 100 facing the second substrate 110 includes a common electrode 102 and a scan electrode 103 along a direction crossing the address electrode 112 (y-axis direction in the drawing). The discharge sustain electrodes 102 and 103 are formed, and a point where the address electrodes 112 on the second substrate 110 and the pair of discharge sustain electrodes 102 and 103 on the first substrate 100 cross each other. It becomes a part which comprises this discharge cell.

Each of the common electrode 102 and the scan electrode 103 is formed at the center of each discharge cell facing the edge of the direction intersecting the direction of the address electrode, the common electrode 102 and the scan electrode 103 are each transparent It consists of electrodes 102a and 103a and bus electrodes 102b and 103b.

The dielectric layer 106 and the MgO passivation layer 108 are sequentially formed on the entire first substrate 100 while covering the discharge sustain electrodes 102 and 103.

In the plasma display panel configured as described above, millions of unit discharge cells are arranged in a matrix form. In order to simultaneously drive the discharge cells arranged in a matrix form, driving is performed using a memory characteristic.

In more detail, in order to cause a discharge between the common electrode 102 and the scan electrode 103 constituting the pair of discharge sustaining electrodes 102 and 103, a potential difference of a specific voltage or more is required, It is called the firing voltage (Vf). The discharge start voltage is lowest at the center of the discharge cell in which the common electrode 102 and the scan electrode 103 have a short discharge gap. Therefore, discharge starts at the center of the discharge cell and diffuses to the entire discharge cell. A relatively strong discharge occurs at the center of the discharge cell where the discharge is started, and a relatively weak discharge occurs at the portion where the partition wall 115 is formed.

The partition wall 115 is a portion in which phosphors are formed on the side surface to generate light of strong intensity, but as described above, relatively weak discharge occurs around the partition wall 115. That is, in the conventional plasma display panel, since the phosphor layer formed on the side surface of the partition wall 115 cannot be effectively utilized, the discharge efficiency is low.

The present invention is to solve the above problems, to provide a plasma display panel with high discharge efficiency by effectively utilizing the fluorescent layer formed on the side wall of the partition.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention, the first substrate and the second substrate disposed opposite to each other; Address electrodes formed in one direction on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; And a first electrode and a second electrode corresponding to each discharge cell while extending in a direction crossing the address electrode on the first substrate, wherein the first electrode extends toward the second electrode. The second electrode has a recess for accommodating the protrusion of the first electrode, wherein the protrusion and the recess are spaced at a first interval in a direction crossing the address electrode and are parallel to the address electrode. Spaced at a second interval that is greater than the interval.

The first spacing edges of the first electrode and the second electrode may be formed in parallel with the address electrode, respectively, and the second spacing edges of the first electrode and the second electrode cross each other with the address electrode. It may be formed in the direction.

Each of the first electrode and the second electrode includes a bus electrode formed on the first substrate so as to extend along a direction crossing the address electrode, and a transparent electrode extending from the bus electrode toward the center of the discharge cell. Protrusions and recesses may be formed in the transparent electrode.

The protruding portion and the concave portion may be formed symmetrically with respect to a reference line passing through the centers of the discharge cells neighboring in the address electrode extending direction.

In addition, the plasma display panel according to another embodiment of the present invention, the first substrate and the second substrate disposed opposite to each other; Address electrodes formed in one direction on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; A first electrode and a second electrode on the first substrate, the bus electrode extending in a direction crossing the address electrode and a protruding electrode extending from the bus electrode into each discharge cell; And a bus electrode formed on the first substrate and extending in a direction crossing the address electrode between the first electrode and the second electrode, and extending from the bus electrode toward the first electrode and the second electrode, respectively. A third electrode including a protruding electrode, wherein the protruding electrode of the third electrode is spaced apart from the protruding electrodes of the first electrode and the second electrode at a first interval in a direction crossing the address electrode, respectively; The bus electrodes of the three electrodes are spaced apart from the protruding electrodes of the first electrode and the second electrode at a second interval in a direction parallel to the address electrodes, respectively, and the first interval is smaller than the second interval.

The protruding electrode of the first electrode and the protruding electrode of the second electrode are each formed between a protruding electrode of the third electrode and a partition wall parallel to the address electrode, or adjacent to each other in a direction crossing the address electrode. The discharge cells may share at least one pair of protruding electrodes of the first electrode and the second electrode.

On the other hand, one driving method of the plasma display panel according to the present invention, the step of applying a reset waveform to the third electrode in the reset period; Applying a scan pulse to the third electrode in the scan period; And applying a common sustain discharge voltage pulse to the first electrode and the second electrode in a sustain discharge period, and applying a sustain discharge pulse alternately to the third electrode.

In addition, another driving method of the plasma display panel according to the present invention comprises the steps of: applying a reset waveform to the third electrode in the reset period; Applying a scan pulse to the third electrode in the scan period; And alternately applying a sustain discharge pulse to the first electrode and the second electrode in the sustain discharge period.

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

1 is a partial plan view of a plasma display panel according to a first embodiment of the present invention.

In the plasma display panel according to the present exemplary embodiment, a plurality of discharges in which a first substrate (not shown) and a second substrate (not shown) are disposed to face each other at predetermined intervals, and a plasma discharge occurs in a space between both substrates The cells 19 are partitioned by the partition walls 15. Phosphor layers (not shown) of red (R), green (G), and blue (B) are formed on the bottom surface of the discharge cells 19 including the partition walls 15.

On the first substrate, a plurality of discharge sustaining electrodes 12 and 13 are formed along one direction (x-axis direction of the drawing) of the substrate, and a direction intersecting with the discharge sustaining electrodes 12 and 13 on the second substrate. A plurality of address electrodes 21 are formed along the (y-axis direction in the drawing).

The barrier ribs 15 are disposed between the address electrodes 21 adjacent to each other, and are formed along a direction parallel to the address electrodes 21. In the present embodiment, the stripe-type partition wall is described as an example. However, the present invention is not limited thereto, and the partition member parallel to the address electrode 21 and the partition member intersecting the address electrode 21 are formed together and discharged. The present invention can also be applied to a closed partition structure that partitions the cell 19.

The discharge sustaining electrodes 12 and 13 are composed of a first electrode 12 and a second electrode 13, and the first electrode 12 and the second electrode 13 are each a transparent electrode 12a, 13a and a bus. It consists of electrodes 12b and 13b. In this case, the transparent electrodes 12a and 13a play a role of causing plasma discharge in the discharge cell 19. It is preferable to use an indium tin oxide (ITO) electrode, which is a transparent electrode, to secure luminance, and the bus electrodes 12b, 13b) is to compensate for the high resistance of the transparent electrode to secure the electrical conductivity, it is preferable to use a metal electrode.

The bus electrodes 12b and 13b of the first electrode and the second electrode are arranged side by side facing each other in a straight line in a direction crossing the address electrode 21 in each discharge cell 19. Protrusions 12a 'extending toward the second electrode 13 are formed in the transparent electrode 12a of the first electrode 12, and the protruding portions are accommodated in the transparent electrode 13a of the second electrode 13. A recess 13a 'is formed. The protruding portion 12a 'and the concave portion 13a' are formed symmetrically with respect to the reference line V passing through the center of the adjacent discharge cells in the extending direction of the address electrode 21 of the discharge cell 19, respectively.

The protruding portion 12a 'and the concave portion 13a' are spaced apart from each other at a first interval L1 in a direction crossing the address electrode 21 (the x-axis direction of the drawing) and parallel to the address electrode 21. In the direction (y-axis direction in the drawing) at a second interval L2. An edge forming the first gap L1 is formed in a direction parallel to the address electrode 21 (y-axis direction in the drawing), and an edge forming the second gap L2 is a direction crossing the address electrode 21 ( X-axis direction in the drawing).

The first gap L1 is smaller than the second gap L2. Therefore, the discharge between the first electrode 12 and the second electrode 13 is first initiated between the edges forming the first interval and diffused into the discharging region forming the second interval. Since a relatively strong discharge occurs at the portion where the discharge is started, a relatively strong discharge occurs at the edge forming the first interval. That is, since strong discharge occurs at the side of the discharge cell, not at the center of the discharge cell, the phosphor layer formed along the side wall of the partition can be excited by the strong discharge. In other words, the phosphor layer is effectively excited, thereby increasing the luminance and improving the discharge efficiency.

Hereinafter, the plasma display panel according to the second and third embodiments of the present invention will be described.

In the plasma display panel according to the second and third embodiments of the present invention, the first substrate, the second substrate, the partition wall, and the phosphor layer have the same structure as the plasma display panel according to the first embodiment, and the discharge is performed. The structure of the sustain electrodes is another embodiment.

2 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

The discharge sustaining electrodes 32, 33, and 34 are formed of the first electrode 32, the second electrode 33, and the third electrode 34, and the first electrode 32, the second electrode 33, and the first electrode 32. The three electrodes 34 consist of the protruding electrodes 32a, 33a, 34a and the bus electrodes 32b, 33b, 34b, respectively. The protruding electrodes 32a, 33a, and 34a serve to cause plasma discharge in the discharge cells 19. It is preferable to use an indium tin oxide (ITO) electrode, which is a transparent electrode, to secure luminance. 32b, 33b, and 34b are used to compensate for the high resistance of the transparent electrode to secure electrical conductivity, and it is preferable to use a metal electrode.

Bus electrodes 32b, 33b, and 34b are formed on the first substrate so as to extend in a direction crossing the address electrode. The protruding electrodes 32a and 33a of the first electrode and the second electrode are formed to extend into the discharge cell 19, respectively, and the protruding electrodes 34a of the third electrode 34 are the first electrode and the second electrode. Extending between the protruding electrodes 32a and 33a.

A pair of protruding electrodes 32a and 33a of the first electrode and the second electrode are formed between the protruding electrode 34a of the third electrode and the partition wall 15 parallel to the address electrode 21.

The protruding electrode 34a of the third electrode is spaced apart from the protruding electrodes 32a and 33a of the first electrode and the second electrode at a first interval L3 in a direction crossing the address electrode 21, respectively. The bus electrode 34b of the third electrode is spaced apart from the protruding electrodes 32a and 33a of the first electrode and the second electrode at a second interval L4 in a direction parallel to the address electrode 21, respectively.

 The first gap L3 is smaller than the second gap L4. Therefore, the discharge in the discharge sustain period starts at the edge forming the first interval L3 and diffuses into the discharging region. Since a relatively strong discharge occurs at the portion where the discharge is started, a relatively strong discharge occurs at the edge forming the first interval (L3). That is, since strong discharge occurs at the side of the discharge cell, not at the center of the discharge cell, it is possible to effectively excite the phosphor layer formed along the sidewall of the partition wall.

3 is a partial plan view of a plasma display panel according to a third embodiment of the present invention.

Referring to FIG. 3, the third embodiment of the present invention has a basic structure in common with the above-described second embodiment, and the structures of the first electrode and the protruding electrode of the second electrode are modified in the second embodiment.

The discharge sustaining electrodes 42, 43, and 44 are composed of the first electrode 42, the second electrode 43, and the third electrode 44, and the first electrode 42, the second electrode 43, and the first electrode 42. The three electrodes 44 consist of the protruding electrodes 42a, 43a, 44a and the bus electrodes 42b, 43b, 44b, respectively.

The adjacent discharge cells 19 share the protruding electrodes 42a and 43a of the first electrode and the second electrode in the direction crossing the address electrode 21 (the x-axis direction in the drawing).

The protruding electrode 44a of the third electrode is spaced apart from the protruding electrodes 42a and 43a of the first electrode and the second electrode at a first interval L5 in a direction crossing the address electrode 21, respectively. The bus electrode 44b of the third electrode is spaced apart from the protruding electrodes 42a and 43a of the first electrode and the second electrode at a second interval L6 in a direction parallel to the address electrode 21, respectively.

 The first gap L5 is formed to be smaller than the second gap L6. Therefore, the discharge in the discharge sustain period starts at the edge forming the first interval L5 and diffuses into the discharging region. Since a relatively strong discharge occurs at the portion where the discharge is started, a relatively strong discharge occurs at the edge forming the first interval (L5). That is, since strong discharge occurs at the side of the discharge cell, not at the center of the discharge cell, it is possible to effectively excite the phosphor layer formed along the sidewall of the partition wall.

Hereinafter, a driving method of the plasma display panel according to the second and third embodiments of the present invention will be described.

4 is a first driving waveform diagram applicable to the plasma display panel according to the second and third embodiments of the present invention. The driving method is a driving method of a three-electrode structure in which the Y electrode, the X electrode, and the address electrode form one discharge cell. The first and second electrodes of the plasma display panel of the second and third embodiments of the present invention As the X electrode, the third electrode functions as the Y electrode.

4, each subfield is composed of a reset period, an address period, and a sustain period.

The reset period consists of the erasing period (I), the Y electrode rising waveform period (II) and the X electrode falling waveform period (III).

In the erasing period (I), a slowly rising potential is applied to the first electrode and the second electrode to rise to Ve. In the Y electrode rising waveform period (II), a waveform rising slowly to Vset is applied to the third electrode while the first and second electrodes are biased to the ground voltage. At this time, negative wall charges are accumulated on the third electrode, and positive wall charges are accumulated on the first and second electrodes. In the Y-electrode falling waveform period (III), a gently falling waveform is applied to the third electrode while the first and second electrodes are biased to Ve. Then, the wall charges of the electrodes of all the cells are evenly erased.

In the address period, while the first and second electrodes are biased to the constant voltage Ve, scan pulses are sequentially applied to the third electrodes to apply scan pulses, and at the same time, the address electrodes are applied to the cells to be discharged. do. As a result, discharge occurs between the third electrode and the address electrode, whereby positive wall charges are accumulated on the third electrode and negative wall charges are accumulated on the first and second electrodes.

In the sustain discharge period, a common sustain discharge voltage pulse is applied to the first and second electrodes, and a sustain discharge pulse alternately to the third electrode is applied. Through the application of such a voltage, sustain discharge occurs in the discharge cells selected in the address period.

5 is a second driving waveform diagram applicable to the plasma display panel according to the second and third embodiments of the present invention. The driving method is a driving method of a four-electrode structure in which the Y electrode, the X electrode, the M electrode, and the address electrode form one discharge cell. The first electrode of the plasma display panel of the second and third embodiments of the present invention is It functions as the Y electrode, the second electrode as the X electrode, and the third electrode as the M electrode.

Referring to FIG. 5, each subfield includes a reset period, an address period, and a sustain period.

The reset period consists of the erasing period (I), the Y electrode rising waveform period (II) and the Y electrode falling waveform period (III). In the erasing period (I), while the first electrode is biased with the voltage Vyc, a waveform that gently falls from the Vmc voltage to the ground voltage is applied to the third electrode to remove the wall charges formed in the previous sustain period. In the third electrode rising waveform period (II), a waveform rising slowly from the voltage Vmd to Vset is applied to the third electrode while the second electrode and the first electrode are biased to the ground voltage during this period. In the third electrode falling waveform period (III), a waveform falling gently from the voltage Vme to the ground voltage is applied to the third electrode while the second electrode and the first electrode are biased at Vxe and Vye, respectively. Then, the wall charges accumulated on the electrodes of all the cells are evenly erased, and positive wall charges are accumulated on the address electrode, and negative wall charges are accumulated on the second electrode, the first electrode, and the third electrode at the same time. .

In the address period, scan pulses are sequentially applied to the third electrodes while the plurality of third electrodes are biased to the Vsc voltage, and at the same time, the address electrodes are applied to the cells to be discharged. At this time, the second electrode is maintained at a ground voltage, and Vye, which is higher than the voltage of the second electrode, is applied to the first electrode. Then, discharge occurs between the third electrode and the address electrode, the discharge extends to the second electrode and the first electrode, positive charge is accumulated on the second electrode and the third electrode, and the first electrode and the address are accumulated. Negative wall charges are accumulated on the electrodes.

In the sustain discharge period, sustain discharge voltage pulses are alternately applied to the second electrode and the first electrode while the third electrode is biased at the sustain discharge voltage Vm. The sustain discharge occurs in the discharge cells selected in the address period by applying such a voltage.

The discharge generated at the beginning of the sustain discharge has a positive voltage pulse applied to the second electrode and a negative voltage pulse applied to the first electrode (where the signs of + and-are equal to the voltage applied to the second electrode). As a relative concept comparing the magnitudes of the voltages applied to the first electrode, the fact that + pulse voltage is applied to the second electrode means that a voltage greater than the first electrode is applied to the second electrode. A positive voltage pulse is applied to the electrode. Discharge of the second electrode / third electrode and the first electrode occurs. In particular, according to the present embodiment, the discharge plays a dominant role between the edges forming the first gap between the third electrode and the first electrode.

After applying the first sustain discharge pulse of sustain discharge, since the voltage of the third electrode is biased to a constant voltage (Vm), the main discharge becomes a discharge between the second electrode and the first electrode, and eventually the second electrode and the first electrode. The input image can be displayed by the number of discharge pulses applied alternately to one electrode.

As described above, according to the second driving method, since the discharge is performed by the short gap discharge between the edges forming the first interval at the initial stage of the sustain discharge, sufficient discharge is performed even in the state where the priming particles are small, and in the normal state, the second electrode and the first electrode are discharged. Since the discharge is performed by the long gap discharge between the electrodes, a stable discharge can be performed.

The waveforms of the first electrode and the second electrode may be driven by changing the waveforms of the first electrode and the second electrode, and the reset waveforms applied to the M electrodes may be applied with various reset waveforms.

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

As described above, in the plasma display panel according to the present invention, since the discharge starts from the side of the discharge cell and the strong discharge occurs from the side of the discharge cell, the phosphor layer formed on the partition wall can be excited by the strong discharge. In other words, the phosphor layer is effectively excited, thereby increasing the luminance and improving the discharge efficiency.

Claims (10)

delete delete delete delete delete A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; A first electrode and a second electrode on the first substrate, the bus electrode extending in a direction crossing the address electrode and a protruding electrode extending from the bus electrode into each discharge cell; And A bus electrode formed on the first substrate to extend across the discharge cell in a direction intersecting the address electrode between a first electrode and a second electrode, and the first electrode from the bus electrode in each of the discharge cells; A third electrode including a protruding electrode extending toward each of the first electrode and the second electrode Including, The protruding electrodes of the third electrode are spaced apart from the protruding electrodes of the first and second electrodes at first intervals in a direction crossing the address electrodes, respectively, and the bus electrodes of the third electrode are formed of the first electrode and the second electrode. And a first gap spaced apart from the protruding electrode of the electrode by a second interval in a direction parallel to the address electrode, wherein the first gap is smaller than the second gap. In claim 6, And a pair of the protruding electrode of the first electrode and the protruding electrode of the second electrode are formed between the protruding electrode of the third electrode and the partition wall parallel to the address electrode. In claim 6, And a discharge cell adjacent in the direction crossing the address electrode shares at least one pair of protruding electrodes of the first electrode and the second electrode. delete In the method of driving the plasma display panel of claim 6, Applying a reset waveform to the third electrode in a reset period; Applying a scan pulse to the third electrode in the scan period; And Alternately applying sustain discharge pulses to the first electrode and the second electrode while maintaining a constant voltage to the third electrode during the sustain discharge period; Method of driving a plasma display panel comprising a.

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