Patent Grant
7400092
This application claims the benefit of Korean Patent Application No. 10-2005-0113831, filed on Nov. 25 , 2005, which is hereby incorporated by reference for all purposes as if fully set forth herein.
1. Field of the Invention
The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which a scan electrode and/or a sustain electrode overlaps with a barrier rib.
2. Description of the Background Art
In general, in a plasma display panel, a barrier rib formed between a front panel and a rear panel forms one discharge cell. Main discharge gas such as neon (Ne), helium (He) or a mixture (He+Ne) of neon and helium and inert gas containing a small amount of xenon (Xe) are filled in each discharge cell. Such a discharge cell is collected in plural, thereby forming one pixel. For example, a red discharge cell, a green discharge cell, and a blue discharge cell are collected and form one pixel.
In such a plasma display panel, when discharge is performed using high frequency voltage, the inert gas generates vacuum ultraviolet rays and excites phosphors provided between the barrier ribs, thereby embodying an image. The plasma display panel is attracting attention as a next generation display apparatus due to its slimness and lightweigtness.
As described above, in the plasma display panel, the discharge is generated in the discharge cell, thereby displaying the image. For example, reset discharge, address discharge, and sustain discharge are generated. The address discharge is discharge for selecting a discharge cell generating the sustain discharge, which is main discharge for displaying the image, from the plurality of discharge cells.
Meantime, the conventional plasma display panel has a drawback of weakly generating the address discharge for selecting the discharge cell generating the sustain discharge.
Accordingly, in the conventional plasma display panel, there is a drawback in that, since the sustain discharge is not generated in the discharge cell in which the sustain discharge should be generated, the image is deteriorated in screen quality or is not even embodied.
Accordingly, an object of the present invention is to solve at least the problems and disadvantages of the background art.
An object of the present invention is to provide a plasma display panel for improving a scan electrode, a sustain electrode, and a barrier rib, thereby stabilizing address discharge.
In another aspect of the present invention, there is provided a plasma display panel comprises first and second electrodes, a first barrier rib, and a second barrier rib. The first and second electrodes are formed on an upper substrate. The first barrier rib is formed over a lower substrate to be disposed under the first electrode. The second barrier rib is formed over the lower substrate to be disposed under the second electrode. A barrier rib center point between the first and second barrier ribs is different from an electrode center point between the first and second electrodes.
In another aspect of the present invention, there is provided a plasma display panel comprising first and second electrodes, a first barrier rib, and a second barrier rib. The first and second electrodes are formed over an upper substrate. The first barrier rib is formed over a lower substrate to be disposed under the first electrode, and comprises first and second scan barrier ribs forming discharge cells different from each other. The second barrier rib is formed over the lower substrate to be disposed under the second electrode, and comprises first and second sustain barrier ribs forming discharge cells different from each other. A barrier rib center point between the first and second barrier ribs is different from an electrode center point between the first and second electrodes.
In a further aspect of the present invention, there is provided a plasma display panel comprising first and second electrodes, a first barrier rib, a second barrier rib, and a discharge cell. The first and second electrodes are formed on an upper substrate. The first barrier rib is formed over a lower substrate to be disposed under the first electrode. The second barrier rib is formed over the lower substrate to be disposed under the second electrode. The discharge cell is defined between the first and second barrier ribs. An overlap area of the discharge cell and the first electrode is different in size from an overlap area of the discharge cell and the second electrode.
In the present invention, there is effect in that the area of the sustain electrode and the barrier rib gets greater than the area of the scan electrode and the barrier rib, thereby getting an area of the scan electrode greater than an area of the sustain electrode within one discharge cell and more stabilizing the address discharge.
The accompany drawings, which are included to provide a further understanding of the invention and are incorporated in 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 to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
In another aspect of the present invention, there is provided a plasma display panel comprises: first and second electrodes formed on an upper substrate; a first barrier rib formed over a lower substrate to be disposed under the first electrode; and a second barrier rib formed over the lower substrate to be disposed under the second electrode, wherein a barrier rib center point between the first and second barrier ribs is different from an electrode center point between the first and second electrodes.
The barrier rib center point is a point corresponding to half of an average distance between the first and second barrier ribs.
The electrode center point is a point corresponding to half of a distance between the first and second electrodes.
Within a discharge cell, an overlap area of the first barrier rib and the first electrode is smaller in size than an overlap area of the second barrier rib and the second electrode.
The first electrode has almost the same width as the second electrode.
The first barrier rib is comprised of first and second scan barrier ribs forming discharge cells different from each other.
The second barrier rib is comprised of first and second sustain barrier ribs forming discharge cells different from each other.
A scan channel is provided between the first and second scan barrier ribs.
A sustain channel is provided between the first and second sustain barrier ribs.
The scan channel comprises the same one black layer.
The first and second electrodes are bus electrodes.
In another aspect of the present invention, there is provided a plasma display panel comprising: first and second electrodes formed on an upper substrate; a first barrier rib formed over a lower substrate to be disposed under the first electrode, and comprising first and second scan barrier ribs forming discharge cells different from each other; and a second barrier rib formed over the lower substrate to be disposed under the second electrode, and comprising first and second sustain barrier ribs forming discharge cells different from each other, wherein a barrier rib center point between the first and second barrier ribs is different from an electrode center point between the first and second electrodes.
The barrier rib center point is a point corresponding to half of an average distance between the first and second barrier ribs.
The electrode center point is a point corresponding to half of a distance between the first and second electrodes.
The first electrode has almost the same width as the second electrode.
A scan channel is provided between the first and second scan barrier ribs.
A sustain channel is provided between the first and second sustain barrier ribs.
The scan channel comprises the same one black layer.
The sustain channel comprises the same one black layer.
In a further aspect of the present invention, there is provided a plasma display panel comprising: first and second electrodes formed on an upper substrate; a first barrier rib formed over a lower substrate to be disposed under the first electrode; a second barrier rib formed over the lower substrate to be disposed under the second electrode; and a discharge cell defined between the first and second barrier ribs, wherein an overlap area of the discharge cell and the first electrode is different in size from an overlap area of the discharge cell and the second electrode.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the attached drawings.
Referring to
The front panel 100 comprises the scan electrode 102 (Y) and the sustain electrode 103 (Z) for performing mutual discharge in one pixel and sustaining emission of light from one discharge space, that is, from a discharge cell. In other words, the front panel 100 comprises the scan electrode 102 (Y) and the sustain electrode 103 (Z) each comprising a transparent electrode (a) formed of indium-tin-oxide (ITO) and a bus electrode (b) formed of metal. The scan electrode 102 (Y) and the sustain electrode 103 (Z) are covered with at least one upper dielectric layer 104, which limits a discharge electric current and insulates an electrode pair. A protective layer 105 is deposited using predetermined protective material, for example, oxide magnesium (MgO), on the upper dielectric layer 104 to facilitate a discharge condition.
The rear panel 110 comprises stripe-type (or well-type) barrier ribs 112 for forming a plurality of discharge spaces (that is, discharge cells). Also, the rear panel 110 comprises a plurality of address electrodes 113 (X) arranged in parallel with the barrier ribs 112, and performing address discharge and generating vacuum ultraviolet rays. Phosphors 114, for example, red (R), green (G), and blue (B) phosphors emit visible rays for displaying the image in the address discharge, and are coated on an upper surface of the rear panel 110. A lower dielectric layer 115 for protecting the address electrode 113 (X) is formed between the address electrode 113 (X) and the phosphor 114.
Considering
Relationship between the scan electrode 102 (Y), the sustain electrode 103 (Z), and the barrier rib 112 in the inventive plasma display panel will be described with reference to
Referring to
In
In order to more clarify the structure of the inventive plasma display panel, a sectional structure of the inventive plasma display panel will be described with reference to
Referring to
The scan electrode 102 and the barrier rib 112 are overlapped at a predetermined portion (d1), and the sustain electrode 103 and the barrier rib 112 are also overlapped at a predetermined portion (d2). The predetermined portion (d1)in which the scan electrode 102 and the barrier rib 112 are overlapped is set in width to be smaller than the predetermined portion (d2) in which the sustain electrode 103 and the barrier rib 112 are overlapped.
That is, as illustrated in
Meantime, as described above, the present invention is characterized in that overlap regions between the respective electrodes and the barrier ribs connected with the electrodes are differently set. This is possible through more detailed arrangement of the electrode and the barrier rib at a predetermined position.
For example, as shown in
The barrier rib center point (Cm) can be obtained from interval between points corresponding to middle heights of the first and second barrier ribs. In other words, if the interval between the points is denoted by “Dm”, the barrier rib center point (Cm) can be a point corresponding to Dm/2.
In the same manner, if a distance between the scan electrode 102 and the sustain electrode 103 is denoted by “De”, the electrode center point (Ce) can be a point corresponding to De/2. The distance (De) between the electrodes can be defined as a distance between ends of the transparent electrode 102a of the scan electrode and the transparent electrode 103a of the sustain electrode. In the above description, the electrode center point (Ce) is defined on the basis of the distance between the ends of the transparent electrodes 102a and 103a, but the electrode center point (Ce) can be defined in the same manner using the bus electrode (b) and, in an ITO-less structure, the electrode center point (Ce) can be defined in the same manner using the bus electrode (b). In other words, effect of the present invention can be obtained by getting the center (Ce) of at least one of the bus electrode (b) and the transparent electrode (a) different from the barrier rib center point (Cm).
As described above, the present invention has arrangement such that the barrier rib center point (Cm) can be positioned at a different point from the electrode center point (Ce), thereby setting the overlap area of the sustain electrode 103 and the barrier rib 112 to be greater than the overlap area of the scan electrode 102 and the barrier rib 112.
As such, reason why the overlap area of the sustain electrode 103 and the barrier rib 112 gets to be greater than the overlap area of the scan electrode 102 and the barrier rib 112 is to stabilize the address discharge.
This will be described with reference to
First, referring to
Referring to
Meantime, the address discharge for selecting the discharge cell in which sustain discharge is generated is generated between the scan electrode 102 and the address electrode 113. In more detail, if a scan pulse is supplied to the scan electrode 102, and a data pulse is supplied to the address electrode 113, a voltage difference between the scan pulse and the data pulse causes generation of the address discharge between the scan electrode 102 and the address electrode 113.
If the overlap area (C) of the scan electrode 102 and the address electrode 113 is relatively increased in width within one discharge cell, when the scan pulse and the data pulse for generating the address discharge are supplied, a relatively large amount of wall charges are generated on the scan electrode 102 and the address electrode 113.
If so, even though the scan pulse and the data pulse having the same voltage and pulse width as those of a conventional art are supplied, the relatively strong and stable address discharge in comparison with the conventional art is generated.
In a description based on another aspect, even when a width (W1) of the scan electrode 102 is the same as a width (W2) of the sustain electrode 103, if the front and rear substrates (not shown) are disposed to get the overlap area (B) of the sustain electrode 103 and the barrier rib 112 to be greater than the overlap area (A) of the scan electrode 102 and the barrier rib 112, even though the width (W1) of the scan electrode 102 is not varied greater than the width (W2) of the sustain electrode 103, the address discharge can be generated more strongly and stably.
Considering it, it is exemplary that the width (W1) of the scan electrode 102 and the width (W2) of the sustain electrode 103 are almost the same.
For another example, the overlap area (B) of the barrier rib 112 and the sustain electrode 103 is 110% to 200% of the overlap area (A) of the barrier 112 and the scan electrode 102. In other words, assuming that the overlap area (A) of the barrier rib 112 and the scan electrode 102 is 1000 μm2, the overlap area (B) of the barrier rib 112 and the sustain electrode 103 is 1100 μm2 to 2000 μm2.
As such, reason why the overlap area (B) of the barrier rib 112 and the sustain electrode 103 is set to be 110% or more of the overlap area (A) of the barrier rib 112 and the scan electrode 102 is to provide sufficient strong and stable address discharge.
Further, the reason why the overlap area (B) of the barrier rib 112 and the sustain electrode 103 is set to be 200% or less of the overlap area (A) of the baffler rib 112 and the scan electrode 102 is that, if the width of the overlap area B of the barrier rib 112 and the sustain electrode 103 is excessively greater than the width of the overlap area (A) of the barrier rib 112 and the scan electrode 102 within one discharge cell in excess of 200%, then the discharge may become unstable at the time of discharge between the scan electrode 102 and the sustain electrode 103, such as, for example, at the time of the sustain discharge, as a result of the wall charges becoming excessively concentrated.
Meanwhile, in order to increase discharge efficiency of the inventive plasma display panel, a channel having a predetermined width can be formed at a portion of the barrier rib. This will be described with reference to
Referring to
In other words, the inventive plasma display panel has an electrode arrangement structure having sequence of the scan electrode 102, a scan electrode 102′, the sustain electrode 103, and a sustain electrode 103′.
Here, one discharge cell partitioned by the barrier rib 112 is denoted by a reference numeral 510.
Meantime, as described above, in the present invention, the interval between the electrodes or the barrier ribs is controlled to differently set the overlap regions of the respective electrodes and the barrier ribs connected to the electrodes.
As shown in
As shown in
In the same manner as described in
As described above, in the present invention, the electrode center point (Ce) is defined on the basis of the distance between the ends of the transparent electrodes 102a and 103a, but the electrode center point (Ce) can be defined in the same manner using the bus electrode (b) and, in an ITO-less structure, the electrode center point (Ce) can be defined in the same manner using the bus electrode (b). In other words, effect of the present invention can be obtained by getting the center (Ce) of at least one of the bus electrode (b) and the transparent electrode (a) different from the barrier rib center point (Cm).
Accordingly, the present invention has arrangement such that the barrier rib center point (Cm) can be positioned at a different point from the electrode center point (Ce), thereby setting the overlap area of the sustain electrode 103 and the barrier rib 112 to be greater than the overlap area of the scan electrode 102 and the barrier rib 112.
Between two scan electrodes 102 and 102′ adjacent with each other and between two sustain electrodes 103 and 103′ adjacent with each other, channels 520a and 520b having predetermined widths are formed at the barrier ribs 112, lengthwise of the scan electrode and the sustain electrode, respectively.
In a detailed description, the channel 520a having the predetermined width is formed at the barrier rib 112 between the scan electrodes 102 and 102′ adjacent with each other, and the channel 520b having the predetermined width (W2) is formed between the two sustain electrodes 103 and 103′.
As such, reason why the channel having the predetermined width is formed at the barrier rib 112 lengthwise of the scan electrode 102 and the sustain electrode 103 is to reduce total capacitance of the inventive plasma display panel, thereby increasing a discharge efficiency of the inventive plasma display panel.
Meanwhile, as described above, the scan electrode 102 and the sustain electrode 103 comprise the transparent electrode (a) and the bus electrode (b), respectively.
The transparent electrode (a) is formed of transparent metallic material, for example, indium-tin-oxide (ITO), and increases transmittance of visible light generated from the plasma display panel but has relatively low electrical conductivity, thereby decreasing the discharge efficiency.
In order to overcome a drawback of reducing the discharge efficiency, the bus electrode (b) is formed of material having relatively high electrical conductivity on the transparent electrode (a). For example, the bus electrode (b) is formed of silver (Ag).
However, since the bus electrode (b) is opaque and also has property of reflecting light, the light reflected from the bus electrode (b) is emitted to the exterior of the plasma display panel.
Since the reflection light causes reduction of the screen quality, a black color is further provided between the transparent electrode (a) and the bus electrode (b), thereby preventing emission of the reflection light.
Further, in the inventive plasma display panel, the mutually adjacent two scan electrodes 102 and 102′ and sustain electrodes 103 and 103′ commonly use one black layer, respectively.
For example, the mutually adjacent two scan electrodes 102 and 102′ commonly use the black layer denoted by a reference numeral 500a, and the mutually adjacent two sustain electrodes 103 and 103′ commonly use the black layer denoted by a reference numeral 500b.
In other words, the channels 520a and 520b provided between the mutually adjacent two scan electrodes 102 and 102′ and between the mutually adjacent two sustain electrodes 103 and 103′ comprise the same one black layers 500a and 500b, respectively.
If the black layers 500a and 500b are commonly used as described above, a manufacture process of the black layers 500a and 500b can be simplified. Further, the black layers 500a and 500b can not only prevent emission of the reflection light reflected from the bus electrodes (b) of the scan electrode 102 and the sustain electrode 103, but also the channels 520a and 520b provided between the barrier ribs 112 can be hidden, thereby improving a characteristic of contrast of the inventive plasma display panel. It should be noted that constituent elements and structures of the above black layers 500a and 500b are not intended to limit this embodiment of the present invention.
It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
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| 10-2005-0113831 | Nov 2005 | KR | national |
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| Number | Date | Country | |
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| 20070120484 A1 | May 2007 | US |
