Patent Application
20080158099
1. Field
This document relates to a plasma display panel.
2. Related Art
In general, a plasma display panel (PDP) applies a reset pulse for initializing a discharge cell, an address pulse for selecting a cell to be discharged, and a sustain pulse for sustaining a discharge of a discharge cell to each electrode by a predetermined number of times according to a gray level value of each subfield and allows a phosphor to emit light by a gas discharge generating through applying of the pulses. The PDP repeats resetting, addressing, and sustaining in each subfield constituting a frame, and it is required to apply an erase pulse for removing wall charges remaining in each electrode side before the each subfield starts in order to improve PDP driving characteristics.
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The front panel 100 comprises pairs of the scan electrode 102 and the sustain electrode 103, which have a transparent electrode (a) made of transparent indium-tin-oxide (ITO) and a bus electrode (b) made of metal, for performing a mutual discharge in one discharge cell and sustaining emission of the cell. The scan electrode 102 and the sustain electrode 103 are covered with at least one upper dielectric layer 104 that limits a discharge current and that insulates each electrode pair. A protective layer 105 deposited with magnesium oxide (MgO) is formed on the upper dielectric layer 104 to facilitate a discharge condition.
The rear panel 110 comprises stripe-type (or well-type) barrier ribs 112, which are arranged in parallel, for forming a plurality of discharge spaces i.e., discharge cells. A plurality of address electrodes 113 for generating vacuum ultraviolet rays by performing an address discharge is arranged in parallel to the barrier ribs 112. Red (R), green (G) and blue (B) phosphors 114 that emit visible rays for displaying an image at an address discharge are coated over an upper surface of the rear panel 110. A lower dielectric layer 115 for protecting the address electrode 113 is formed between the address electrode 113 and the phosphor 114.
The front panel of the plasma display panel will be described in more detail with reference to
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However, the plasma display front panel and rear panel shown in and described with reference to
In an aspect, a plasma display panel comprises a front panel having a front glass, and a rear panel opposing the front panel, wherein the rear panel comprises a rear glass positioned to face the front glass, an address electrode formed on the rear glass, a lower dielectric layer covering the address electrode, a barrier rib, positioned on the lower dielectric layer, partitioning a discharge cell, wherein at least one of a scan electrode and a sustain electrode is formed inside the barrier rib, wherein a gap between the scan electrode and the sustain electrode is greater than a height of the barrier rib, and the address electrode intersects with the scan electrode and the sustain electrode and has a protrusion electrode in proximity to the scan electrode.
The scan electrode may be formed inside the barrier rib, and the sustain electrode may be formed inside another barrier rib opposing the barrier rib inside which the scan electrode is formed.
The scan electrode and the sustain electrode each may be formed inside the barrier rib.
The scan electrode and the sustain electrode each may be formed to correspond to each other in the barrier ribs. Upper dielectric layers may be formed on one-side surfaces of the barrier ribs.
The upper dielectric layers may be formed on the one-side surfaces of the barrier ribs at which the scan electrode and the sustain electrode face with each other.
A distance between the scan electrode and the sustain electrode may be 100 um to 400 um.
A distance between the scan electrode and the sustain electrode may be 150 um to 350 um.
A distance between the scan electrode and the sustain electrode may be a distance between a transparent electrode of the scan electrode and a transparent electrode of the sustain electrode.
The protection electrode of the address electrode may be provided in plurality.
The protrusion electrode of the address electrode may be protruded from any one side or both sides of the address electrode. The plurality of protrusion electrodes may be positioned on a side surface of the address electrode, and may be connected with the address electrode to protrude by a predetermined length.
The plurality of protrusion electrodes may be positioned on an upper surface of the address electrode, and may be protruded by a predetermined length to intersect with the address electrode.
The plurality of protrusion electrodes may be positioned on an upper surface of the lower dielectric layer covering the address electrode, and may be protruded by a predetermined length to intersect with the plurality of address electrodes. A distance between the scan electrode and the sustain electrode may be 100 um to 400 um.
A distance between the scan electrode and the sustain electrode may be 150 um to 350 um.
A distance between the scan electrode and the sustain electrode may be a distance between a transparent electrode of the scan electrode and a transparent electrode of the sustain electrode.
The accompany 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.
Specific embodiments of the present invention will be described in a more detailed manner with reference to the drawings.
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The rear panel comprises a rear glass 410; a plurality of address electrodes 411 comprising a plurality of protrusion electrodes (not shown) formed on an upper surface of the rear glass 410; and a lower dielectric layer 412b covering the plurality of address electrodes 411.
A plurality of barrier ribs 413 are formed on an upper surface of the lower dielectric layer 412b to partition a discharge cell. A phosphor layer 414 is formed in a light emitting space provided between the plurality of barrier ribs 413. One or more scan electrodes 415 and sustain electrodes 416 are formed inside the plurality of barrier ribs 413 according to the present invention. Desirably, the scan electrode 415 is formed inside one of the plurality of barrier ribs 413, and the sustain electrode 416 is formed inside another barrier rib 413 positioned to face the one barrier rib 413 and formed to partition one discharge cell. More desirably, the scan electrode 415 and the sustain electrode 416 each are positioned in the centers of the barrier ribs 413, and are formed to correspond to each other in the barrier ribs 413.
Upper dielectric layers 412a are formed on one-side surfaces of the barrier ribs 413 comprising the scan electrode 415 and the sustain electrode 416. Desirably, the upper dielectric layers 412a are formed on one-side surfaces of the barrier ribs 413 on which the scan electrode 415 and the sustain electrode 416 face with each other.
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Because the plasma display panel is of a long gap structure in which a gap between the scan electrode 615 and the sustain electrode 616 is greater than a height of the barrier rib 613, its discharge efficiency can be more improved. The gap between the scan electrode 615 and the sustain electrode 616 can be within a range of about 100 μm to 400 μm. Also, the gap between the scan electrode 615 and the sustain electrode 616 can be controlled within a range of about 150 μm to 350 μm, thereby optimizing the discharge efficiency. Here, the gap between the scan electrode 615 and the sustain electrode 616 can be defined as a gap between a transparent electrode of the scan electrode 615 and a transparent electrode of the sustain electrode 616.
In a plasma display panel according to another exemplary embodiment of the present invention, an address electrode 611 can be improved in structure, thereby more improving a light emitting luminance and a discharge efficiency. The plasma display panel according to another exemplary embodiment of the present invention will be described with reference to
A distance between the scan electrode and the sustain electrode may be 100 um to 400 um. Further, discharge efficiency can be increased in a long gap structure in which a distance between the scan electrode and the sustain electrode is adjusted to 150 um to 350 um. Here, a distance between the scan electrode and the sustain electrode may be defined as a distance between a transparent electrode of the scan electrode and a transparent electrode of the sustain electrode.
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The rear panel comprises a rear glass 710; a plurality of address electrodes 711 comprising a plurality of protrusion electrodes 711a formed on an upper surface of the rear glass 710; and a lower dielectric layer 712b covering the plurality of address electrodes 711. In the present invention, the plurality of address electrodes 711 comprise the plurality of protrusion electrodes 711a in proximity to the scan electrode 715. The plurality of protrusion electrodes 711a are positioned on upper surfaces of the plurality of address electrodes 711. The plurality of protrusion electrodes 711a intersect with the plurality of address electrodes 711 to protrude by a predetermined length. The protrusion electrode 711a can protrude from any one side or both sides of the address electrode 711. Alternatively, the protrusion electrode 711a can be provided in plurality in the address electrode formed in one discharge cell.
A plurality of barrier ribs 713, a phosphor layer 714, the scan electrode 715, and a sustain electrode 716 are formed on an upper surface of the lower dielectric layer 712b in the same manner as in the plasma display panel shown in and described with reference to
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In a plasma display panel according to another exemplary embodiment of the present invention, an address electrode can be improved in structure, thereby more improving a light emitting luminance and a discharge efficiency. The plasma display panel according to another exemplary embodiment of the present invention will be described with reference to
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The rear panel comprises a rear glass 1010; a plurality of address electrodes 1011 formed on an upper surface of the rear glass 1010; and a first lower dielectric layer 1012b covering the plurality of address electrodes 1011. In the present invention, the plurality of protrusion electrodes 1011a are formed on an upper surface of the first lower dielectric layer 1012b in proximity to the scan electrode 1015. A second lower dielectric layer 1012c is formed to cover the plurality of protrusion electrodes 1011a.
Desirably, the plurality of protrusion electrodes 1011a are positioned on an upper surface of the first lower dielectric layer 1012b to cover the plurality of address electrodes 1011, and are protruded by a predetermined length to intersect with the plurality of address electrodes 1011.
A plurality of barrier ribs 1013, a phosphor layer 1014, the scan electrode 1015, and a sustain electrode 1016 are formed on an upper surface of the second lower dielectric layer 1012c in the same manner as in the plasma display panels shown in and described with reference to
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As described above, the present invention has an effect that the front panel and the rear panel can be improved in structure, thereby improving the light emission luminance and the discharge efficiency in plasma discharge.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be comprised within the scope of the following claims.
